内容正文:
“橘生淮南则为橘,生于淮北则为枳 ”
什么是遗传?
“种瓜得瓜,种豆得豆”,
“龙生龙,凤生凤,老鼠生儿打地洞”
汉水丑生侯伟作品
基因的发现
基因在哪?
基因是什么?
基因怎么起作用?
基因的变化
基因与进化的关系
必修二 第一章 第1节
第1节 孟德尔的豌豆杂交实验(一)
问题探讨
人们曾经认为,两个亲本杂交后,双亲的遗传物质会在子代体内发生混合,使子代表现出介于双亲之间的性状。就像把一瓶蓝墨水和一瓶红墨水倒在一起,混合液是另外一种颜色,再也无法分出蓝色和红色。这种观点也称作融合遗传。
讨论
1.按照上述观点,当红花豌豆与白花豌豆杂交后,子代的豌豆花会是什么颜色?
2.你同意上述观点吗?你的证据有哪些?
红花豌豆和白花豌豆
粉色,根据融合遗传的观点,即红色和白色的混合色粉色。
不同意,因为自然界的遗传现象并不是融合遗传的结果。
现代遗传学之父---孟德尔
孟德尔(1822-1884),奥地利人。自幼出身园艺世家,酷爱自然科学。由于家境贫寒,21岁起做修道士;后来到大学进修自然科学和数学。他选用豌豆、玉米、山柳菊等植物,连续进行了 多年的杂交实验研究,其中最成功的是豌豆杂交实验。真正做到了“简单的事情重复做,重复的事情用心做,用心的事情坚持做”
孟德尔
主要工作:
1856-1864进行了8年的豌豆杂交实验,在1865年发表了《植物杂交试验》的论文,提出分离定律和自由组合定律。
为什么豌豆的杂交实验非常成功呢?
花药
花丝
雄蕊
子房
花柱
柱头
雌蕊
花瓣
花萼
花托
花柄
花的结构
一、豌豆用作遗传实验材料的优点
1.自花传粉,闭花受粉,一般都是纯种。
自花传粉:两性花的花粉,落到 的雌蕊柱头上的过程,也叫 。
同一朵花
自交
异花传粉: 之间的传粉过程。
两朵花
两性花:一朵花既有雄蕊,又有雌蕊。如豌豆
86187 (8) -
豌豆花 → 自花传粉,闭花受粉
单性花:一朵花只有雄蕊,或只有雌蕊。如玉米,葫芦。
玉米
◇玉米雄花的花粉落在同一植株的雌花的柱头上,所完成的传粉过程也属于自交
雄花
雌花
◇玉米在自然状态下间行种植,既会发生自交,也会发生杂交
自交
杂交
相关信息
人工异花传粉(人工杂交)
供应花粉的植株
父本(♂)
接受花粉的植株
母本(♀)
思考:自然状态下两株豌豆能否异花传粉?
如何进行人工异花传粉?
不能
因为豌豆花是自花传粉,闭花授粉,一般情况下都是纯种,那怎样才能让豌豆花之间发生杂交呢?自然状态下行不行?
人工异花传粉示意图
套袋
人工授粉
套袋
去雄
避免外来花粉的干扰
除去母本未成熟花的全部雄蕊
待雌蕊成熟时,采集另一植株的花粉,撒在去雄花的雌蕊柱头上
避免外来花粉的干扰,保证杂交得到的种子是人工传粉后所结
人工异花传粉的一般步骤:
练习
1、用豌豆做遗传实验时,下列操作错误的是( )
A.杂交时,需在开花前除去母本的雄蕊
B.自交时,雌蕊和雄蕊都无需除去
C.杂交时,需在开花前除去母本的雌蕊
D.人工授粉后,应套袋
C
2、具有易于区分的性状且能够稳定地遗传给后代
性 状:
相对性状:
生物体所表现的形态、结构和生理生化等特征的总称。
一种生物的同一性状的不同表现类型。
下列各组生物性状中属于相对性状的是( )
A.番茄的红果和圆果
B.水稻的早熟和晚熟
C.绵羊的长毛和细毛
D.马的白毛和鼠的褐毛
B
豌豆用作遗传实验材料的优点
优点1:豌豆是自花传粉和闭花授粉植物
避免了外来花粉的干扰,豌豆在自然状态下一般都是纯种,用豌豆做人工杂交实验结果既可靠,又容易分析。
优点2:豌豆具有易区分相对性状
进行杂交实验时很容易观察和分析实验结果
2.孟德尔所进行的杂交组数: 正反交
3.在遗传图解中常用的符号:
1.孟德尔所用的实验材料:纯种高茎豌豆×纯种矮茎豌豆
含义 亲本 母本 父本 自交 杂交 子一代 子二代
符号
P
♀
⊗
F1
F2
×
♂
高茎♀×矮茎♂
正交:
反交:
高茎♂×矮茎♀
正交
反交
高茎的花
矮茎的花
二、一对相对性状的杂交实验
×
P
(亲代)
F1
(子一代)
全为高茎
提出问题:F1全为高茎,是因为子代性状仅由母本控制吗?
正交与反交是相对的。
若(♀)高茎×(♂)矮茎为正交
则(♂)高茎×(♀)矮茎为反交
上述杂交实验中无论正交还是反交,F1都表现为高茎。
×
P
(亲代)
F1
(子一代)
全为高茎
♀
♂
二、一对相对性状的杂交实验
——观察分析,提出问题
♀
♂
自交
F2
高茎
矮茎
P
高茎♂
F1
高茎
矮茎♀
×
(杂交)
高茎♀×矮茎♂
正交:
反交:
高茎♂×矮茎♀
F1都是高茎
1.为什么子一代都是高茎而没有矮茎呢?
2.为什么子二代中矮茎又出现了呢?
生物的性状既不会相互融合,也不会在传递中消失。矮茎性状在子一代(F1)只是隐而未现。F2中出现性状分离,同时出现高茎和矮茎。
二、一对相对性状的杂交实验
——观察分析,提出问题
一对相对性状的亲本杂交,杂种子一代显现出来的性状
一对相对性状的亲本杂交,杂种子一代未显现出来的性状
在杂种后代中,同时显现出显性性状和隐性性状的现象
性状分离
显性性状
隐性性状
P
高茎♂
F1
高茎
自交
F2
矮茎♀
高茎787
矮茎277
×
(杂交)
3 ∶ 1
对F2中不同相对性状的个体数量统计,进而得出的比例。
性状分离比
3. F2出现3:1的性状分离比是偶然的吗?
性状 F2的表现
显性 隐性 显性:隐性
茎的高度 787(高) 277(矮) 2.84:1
种子形状 5474(圆滑) 1850(皱缩) 2.96:1
子叶颜色 6022(黄色) 2001(绿色) 3.01:1
花的颜色 705(红色) 224(白色) 3.15:1
豆荚形状 882(饱满) 299(不饱满) 2.95:1
豆荚颜色 428(绿色) 152(黄色) 2.82:1
花的位置 651(叶腋) 207(茎顶) 3.14:1
F2的数量越多,性状分离比越接近3:1。
——观察分析,提出问题
是什么原因导致遗传性状在杂种后代中按一定的比例分离呢?
提出问题
决定
显性遗传因子(D)
隐性遗传因子(d)
显性性状
决定
隐性性状
相对性状
1.生物的性状是由遗传因子决定的。
摒弃融合遗传,提出四点假说(颗粒遗传思想)
这些因子就像一个个独立的颗粒,既不会相互融合,也不会在传递中消失。
三、对分离现象的解释
——推理想象,提出假说
为了解释实验现象
摒弃融合遗传,提出四点假说(颗粒遗传思想)
2.在体细胞中,遗传因子是成对存在的。
DD
dd
Dd
遗传因子组成相同的个体
遗传因子组成不同的个体
杂合子
F1高茎
纯合子
纯种高茎
纯种矮茎
摒弃融合遗传,提出四点假说(颗粒遗传思想)
3.生物体在形成生殖细胞——配子时,成对的遗传因子彼此分离,分别进入不同的配子中。配子中只含有每对遗传因子中的一个。
摒弃融合遗传,提出四点假说(颗粒遗传思想)
4.受精时,雌雄配子的结合是随机的。例如,含遗传因子D的配子,既可以与含遗传因子D的配子结合,又可以与含遗传因子d的配子结合。
Dd
高茎
×
Dd
高茎
配子 :
F1 :
D
d
D
d
F2 :
高茎
高茎
矮茎
1 : 2 : 1
DD
Dd
Dd
dd
3 : 1
对分离现象的解释—遗传图解
D d
D DD Dd
d Dd dd
♂
♀
棋盘法
1 :1
1 :1
Dd
高茎
×
Dd
高茎
配子 :
F1 :
D
d
D
d
F2 :
高茎
高茎
矮茎
1 : 2 : 1
DD
Dd
Dd
dd
3 : 1
对分离现象的解释—遗传图解
(1)正确写出遗传因子组成
(2)正确写出个体性状表现
(3)正确写出箭头、符号和配子
(4)正确写出后代比例
Dd
高茎
×
Dd
高茎
F1 :
1 : 2 : 1
Dd
高茎
F1:
P:
高茎
矮茎
D
d
配子:
DD
dd
配子:
D
d
D
d
F2 :
DD
Dd
Dd
dd
高茎
矮茎
(1)配子的结合方式: 种。
(2)遗传因子组成: 种,分别为 ,其比例为 。
(3)产生后代的性状表现: 种,分别为 ,其比例为 。
4
3
DD、Dd、dd
1∶2∶1
2
高茎、矮茎
3∶1
摒弃融合遗传,提出四点假说(颗粒遗传思想)
1.生物的性状是由遗传因子决定的。
2.在体细胞中,遗传因子是成对存在的。
3.形成配子时,成对的遗传因子彼此分离,分别进入不同的配子中。
4.受精时,雌雄配子的结合是随机的。
核心假说:
成对的遗传因子彼此分离,分别进入不同的配子中。
其他假说都是为核心假说的提出而服务的。
预习思考:
1.甲、乙两个小桶分别模拟什么?
模拟雌、雄生殖器官
2.甲、乙小桶内的彩球分别模拟什么?
模拟雌、雄配子
3.不同彩球的随机组合,模拟什么?
模拟生物生殖过程中,雌、雄配子的随机结合。
探究实践:性状分离比的模拟实验
我们可以通过模拟实验,来体验孟德尔的假设。
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1.目的要求
通过模拟实验,理解遗传因子的_____、配子的_________与性状之间的数量关系,体验孟德尔的假说。
分离
随机结合
2.材料用具
①两个小桶,分别标记甲、乙
②两种大小相同、颜色不同的彩球各20个,一种彩球标记D,另一种彩球标记d
③记录用的纸和笔。
探究实践:性状分离比的模拟实验
我们可以通过模拟实验,来体验孟德尔的假设。
31
1.分别摇动甲、乙小桶,使桶内小球充分混合。
2.从两个桶内随机抓取一个小球,放在一起。记录两个彩球的字母组合。
3.将抓取的小球放回原来的小桶。
重复30次以上
4.统计不同字母组合的数量及其比例。
3.实验步骤
思考:
①为什么要重复30次以上?
因为实验统计的样本数量越大,越接近统计规律,统计结果越可靠。
探究实践:性状分离比的模拟实验
32
①为什么每次抓取后要将小球放回?
保证下次抓取时两种小球的数目相同,从而使抓取到两种小球的几率相同。
思考:
②每次抓取一个彩球代表什么?
每次抓取一个小球,代表产生配子。
③不同彩球组合代表什么?
不同彩球组合代表子代遗传因子组成。
探究实践:性状分离比的模拟实验
33
思考:
④甲乙两桶中小球总数一定要相同吗?
甲乙两桶中小球总数不一定要相同。
实际上,在生物体的生殖过程中,一般是雄配子的数量远超过雌配子的数量。
⑤每个小桶中标有D的小球和标有d的小球数一定要相同吗?
每个小桶中标有D的小球和标有d的小球数一定要相同。
雄/雌配子中D:d=1:1
探究实践:性状分离比的模拟实验
实际上,在生物体的生殖过程中,一般是雄配子的数量远超过雌配子的数量。因此,两个小桶中的彩球不必一样多,模拟雄性生殖器官的小桶中的彩球可以多一些。
34
性状分离的模拟实验
5.结果和结论
①统计实验结果 设计表格,记录实验结果
次数 甲 乙 组合
1
2
......
30
合计
次数 D__次,d__次 D__次,d__次 DD__次
Dd__次
dd__次
统计
数量比 D:d=____ D:d=____ DD:Dd:dd=_____
探究实践:性状分离比的模拟实验
4.注意事项
①抓取彩球时,不要挑选,可以背过脸或眼睛看着别处,保证抓取的随机性。
②抓取的彩球一定要放回原来的小桶内,以保证小桶内两种颜色的彩球数量相等。
③每次抓取彩球前,一定要摇匀。
5.结果和结论
统计样本足够大的情况下,
a.两种雌配子,D:d≈________
b.两种雄配子,D:d≈________
c.子代遗传因子组成,DD:Dd:dd≈________
d.子代性状分离比,显性:隐性≈________
1:1
1:1
1:2:1
3:1
36
练习
1.下列是对“一对相对性状的杂交实验”中性状分离现象的各项假设性解释,其中错误的是( )
A. 生物的性状是由细胞中的遗传因子决定的
B. 体细胞中的遗传因子成对存在,互不融合
C. 在配子中只含有每对遗传因子中的一个
D. 生物的雌雄配子数量相等,且随机结合
D
2.基因型为Aa的植物体产生的雌雄配子的数量是( )
A.雌配子∶雄配子=1∶1 B.雄配子比雌配子多
C.雄配子∶雌配子=3∶1 D.雄配子A∶雌配子a=1∶3
B
对分离现象的解释
F1
P
大胆猜测,提出假设
孟德尔在观察和统计分析的基础上,摒弃了前人融合遗传的观点,对分离现象的原因提出了如下假说:
生物体在形成配子时,成对的遗传因子彼此分离,分别进入不同的配子中,配子中只含每对遗传因子的一个。
受精时,雌雄配子的结合是随机的。
生物的性状是由遗传因子决定的。
体细胞中遗传因子是成对存在的。
显性遗传因子(D)
隐性遗传因子(d)
纯种高茎:DD
纯种矮茎:dd
F1高茎:Dd
DD
dd
D
d
Dd
配子
Dd
Dd
D
d
D
d
DD
Dd
Dd
dd
高茎 : 矮茎 = 3 : 1
F1
配子
F2
1 : 2 : 1
1.设计测交实验
让F1与隐性纯合子杂交,用来测定F1遗传因子组成。
根据假说,推测测交后代中高茎与矮茎植株的数量比应为1:1。
P
配子
F1
Dd
dd
d
d
Dd
dd
D
杂种子一代
高茎
1 : 1
隐形纯合子
矮茎
高茎
矮茎
思考:测交实验关键要验证什么?
F1(Dd)是否产生了两种配子(D和d),且比例为1:1
——演绎推理,实验检验
四、对分离现象解释的验证
39
设计思路:
隐性纯合子dd只产生一种含有隐性遗传因子d的配子,测交后代的性状表现应该只由F1产生的配子种类和比例来决定。
因此,可以通过观察测交后代的性状表现和比例来推测F1产生的配子种类和比例,进而推测F1的遗传因子组成。
演绎推理过程如下:
P
配子
F1
Dd
dd
d
d
Dd
dd
D
杂种子一代
高茎
1 : 1
隐形纯合子
矮茎
高茎
矮茎
40
得到的166株后代中,87株是高茎的,79株是矮茎的,高茎与矮茎植株的数量比接近1∶1。
2.测交实验结果
证明假说是正确的
即成对的遗传因子彼此分离,分别进入不同的配子中。
实验数据与理论分析相符
3.测交实验结论
41
通过测交后代的表现型和比例,可推知
①F1产生的配子的________________
②F1在形成配子时___________________________
③F1的_________________
种类和比例
成对的遗传因子发生分离
遗传因子组成
42
在生物的体细胞中,控制__________的遗传因子_____存在,不相互融合;在形成______时,成对的遗传因子彼此分离,分离后的遗传因子分别_________________,随配子遗传给后代。
同一性状
成对
配子
进入不同的配子中
五、分离定律(孟德尔第一定律)
实质:
Dd
D
d
分离定律的适用范围:
必须是有性生殖的生物
必须是真核生物
必须是细胞核遗传
必须是一对相对性状的遗传
43
1.子一代个体形成的配子数目相等且生活力相同;
2.雌、雄配子结合的机会相等;
3.子二代各个体的存活率相等;
4.遗传因子间的显隐性关系完全相等(完全显性);
5.观察的子代样本数目够多。
孟德尔遗传实验需要满足以下条件:(大本P)
“三法”验证分离定律
(1)自交法:杂合子自交后代的性状分离比为3∶1,则符合基因的分离定律,性状由位于一对同源染色体上的一对等位基因控制。
(2)测交法:若测交后代的性状分离比为1∶1,则符合基因的分离定律,性状由位于一对同源染色体上的一对等位基因控制。
(3)花粉鉴定法:非糯性与糯性水稻的花粉遇碘液呈现不同颜色。取F1的花粉,用碘液染色后在显微镜下观察,如果观察到花粉有两种,且比例为1:1,则符合分离定律。此法只适用于一些特殊的植物(如水稻等)。
分离定律
分离定律在生物的遗传中具有普遍性。
46
小麦的
高秆和矮杆
家鸡的羽腿和光腿
两只白色绵羊生出黑色小羊
父母正常而其子女患白化病
小结:
方式 含义 表示式
杂交 遗传因子组成不同的生物个体间相互交配的方式 AA×aa Aa×AA
自交 遗传因子组成相同的生物个体间相互交配的方式 AA×AA Aa×Aa
测交 显性杂合个体与隐性纯合子杂交 Aa×aa
正交与反交 若甲(♀)×乙(♂)为正交,则乙(♀)×甲(♂)为反交,正、反交是相对而言的 正交:
甲(♀)×乙(♂)
反交∶
乙(♀)×甲(♂)
遗传学中的几种常见交配方式(大本P)
杂交实验中使用的遗传术语
概念 内容 符号
父本
母本
亲本
子一代
子二代
配子 无
合子 无
基因分离定律的概念梳理
概念 内容
杂交
自交
正交、反交
性状
相对性状
显性性状
隐性性状
性状分离
遗传因子
显性遗传因子
隐性遗传因子
纯合子
杂合子
她怎么盯着我看
可能是喜欢我
找她加微信应该没问题
“美女加个微信”
“啪”
②提出假说
③演绎推理
④实验验证
①发现问题
**假说—演绎法:
在观察和分析基础上提出问题,通过推理和想象提出解释问题的假说,根据假说进行演绎推理,再通过实验检验演绎推理的结论。如果实验结果与预期相符,就证明假说是正确的,反之则说明假说是错误的。这是现代科学研究中常用的一种科学方法,叫作假说—演绎法。
⑤得出结论
好好学习,天天向上!
观察现象提出问题
分析问题提出假说
1.遗传因子决定生物的性状
2.体细胞中遗传因子成对存在
3.成对的遗传因子在形成配子时分离
4.雌雄配子在受精时随机结合
高茎豌豆与矮茎豌豆杂交,F1全为高茎,F1自交后代F2中高茎植株与矮茎植株的比例约为3:1。
(1)F1全为高茎,矮茎哪里去了呢?
(2)F2中矮茎又出现了,说明了什么?
(3)为什么后代的表现型比例都接近3:1?
现象
问题
假说—演绎法
演绎推理
观察现象提出问题
分析问题作出假说
测交后代
Dd
dd
D
d
Dd
配子
高茎
矮茎
1 : 1
(杂种子一代)
高茎
(隐性纯合子)矮茎
d
dd
测交
×
假说正确!
实验验证
测交实验结果:
结果与预期相符
高茎豌豆 矮茎豌豆
测交后代 30株 34株
比例 高茎:矮茎≈1:1
得出结论总结规律
观察现象提出问题
演绎推理
分析问题作出假说
分离定律:
在生物的体细胞中,控制同一性状的遗传因子成对存在,不相融合;在形成配子时,成对的遗传因子发生分离,分离后的遗传因子分别进入不同的配子中,随配子遗传给后代。
(1)自交法(已知或未知显、隐性性状):主要应用于植物,而且操作最简单。
(2)测交法(已知显、隐性性状):适用于植物和动物。
待测个体自交
若后代无性状分离,则待测个体为纯合子
若后代有性状分离,则待测个体为杂合子
待测个体×隐性纯合子
若后代无性状分离,则待测个体为纯合子
若后代有性状分离,则待测个体为杂合子
(3)配子鉴定法:若某个体能产生两种类型的配子,则为杂合子;若只产生一种配子,则为纯合子。
六、分离定律的概率计算及应用
纯合子和杂合子的判断方法:
习题巩固
二、拓展应用
1.水稻的非糯性和糯性是一对相对性状,非糯性花粉中所含的淀粉为直链淀粉,遇碘变蓝黑色,而糯性花粉中所含的是支链淀粉,遇碘变橙红色。现在用纯种的非糯性水稻和纯种的糯性水稻杂交,取 F1 花粉加碘液染色,在显微镜下观察,半数花粉呈蓝黑色,半数呈橙红色。请回答下列问题:
(1)花粉出现这种比例的原因是什么?
在F1水稻细胞中含有一个控制支链淀粉合成的遗传因子和一个控制直链淀粉合成的遗传因子。在F1形成配子时,两个遗传因子分离,分别进入不同的配子中,含支链淀粉遗传因子的配子合成支链淀粉,遇碘变橙红色;含直链淀粉遗传因子的配子合成直链淀粉,遇碘变蓝黑色,其比例为1:1。
习题巩固
(2)实验结果验证了什么?
分离定律。即在F形成配子时,成对的遗传因子发生分离,分离后的遗传因子分别进入不同的配子中。
(3)如果让 F1 自交,F2 中花粉有 种类型。
2
确定遗传因子的组成:
1.以因求果题的思路是(正推型):亲代遗传因子组成(基因型)→双亲配子型及其概率 →子代遗传因子组成(基因型)及其概率→子代表现型及其概率。
2.由果推因题的思路是(逆推型):子代表现型比例→双亲交配方式 →双亲遗传因子组成(基因型)。
3.遗传系谱题:明确系谱符号的含义,根据系谱判断显隐性遗传的主要依据和推知亲代遗传因子组成(基因型)与预测未来后代表现型及其概率的方法。
亲本 子代遗传因子组成及比例 子代性状及比例
AA ╳ AA
AA ╳ Aa
AA ╳ aa
Aa ╳ Aa
Aa ╳ aa
aa ╳ aa
AA
AA:Aa=1:1
Aa
AA:Aa:aa=1:2:1
Aa:aa=1:1
aa
全为显性
全为显性
全为显性
显性:隐性=3:1
显性:隐性=1:1
全为隐性
一对相对性状的六种结合方式及子代遗传因子、表现型的比例
例题:番茄茎的有毛(H)对无毛(h)是显性。现有基因型为Hh 和Hh的两个亲本杂交,问它们的后代可以产生哪几种表现型和遗传因子组成(基因型),这几种表现型和遗传因子组成(基因型)的概率各是多少? (正推型)
后代有2种表现型:有毛和无毛。
3种遗传因子组成:HH、Hh 、hh,它们的概率分别是:1/4、1/2、1/4
2.由果推因题的思路是(逆推型):
后代表现型 亲本基因型合 亲本表现型
显性:隐性为3 : 1 双亲一定是杂合子(Aa)
显性:隐性为1 : 1 双亲一定是测交类型
全显性 双亲中一定有一个是显性纯合子
全隐性 双亲均为隐性纯合子
Aa × Aa
Aa × aa
AA ×AA
(Aa或aa)
aa × aa
(1) 根据分离定律中规律性比值直接判断
①根据亲代表现型→写出能确定的基因(如显性性状的基因型用A_表示)→根据子代一对基因分别来自两个亲本→推知亲代未知基因。
②若亲代为隐性性状,基因型只能是aa。
(2) 基因填充法
(3) 隐性纯合突破法
若子代出现隐性性状,则其基因型一定是aa,亲代基因型中必定含有一个a基因,然后再根据亲代的表现型进一步判断。
例题: 豚鼠的毛色由一对等位基因B和b控制。黑毛雌鼠甲与白毛雄鼠丙交配,甲生殖共8只黑毛豚鼠和6只白毛豚鼠。黑毛雌鼠乙与白毛雄鼠丙交配,乙生殖共生15只黑毛隊鼠。问 甲、乙、丙3只亲鼠的遗传因子组成(基因型)。
1.判断豚鼠毛色的显隐关系。
2.根据性状表现初步确定遗传因子组成;
(隐性性状—dd,
显性性状—Dd或DD→D_)
亲代
子代
甲♀
丙♂
乙♀
丙♂
×
×
黑毛
白毛
白毛
黑毛
B ―
bb
B ―
bb
B―
bb
(黑毛)
(白毛)
1 : 1
B―
(黑毛)
b
B
(1)根据经典公式或分离比计算:
Aa×Aa → 1AA:2Aa:1aa
遗传概率的计算:
①概率= ×100%
②根据分离比计算
AA、aa出现的概率各是 , Aa出现的概率是 ,显性性状出现的概率是 ,隐性性状出现的概率是 ,显性性状中杂合子的概率是 。
(2)根据配子概率计算
①先计算亲本产生每种配子的概率。
②根据题目要求用相关的两种(♀、♂)配子的概率相乘,即可得出某一基因型的个体的概率。
③计算表现型概率时,再将相同表现型的个体的概率相加即可。
例题:一对肤色正常的父方,生一个肤色正常的儿子和一个白化病的儿子,若肤色正常的儿子和一个白化病的女孩结婚,则①后代患白化病的概率是多少? ②后代患白化病男孩的概率是多少?
①后代患白化病的概率为:⅔×½=⅓
②后代患白化病男孩的概率为:⅔×½×½=1/6
原则:分步相乘,分类相加。
遗传系谱题:明确系谱符号的含义,根据系谱判断显隐性遗传的主要依据和推知亲代遗传因子组成(基因型)与预测未来后代表现型及其概率的方法
①家系是指在一个连续的世代中,有共同祖先的若干个家庭构成的集合体,例如,祖父母、父母、叔伯、儿孙等家庭可以构成一个家系。
②这种图解叫做“系谱图”,常用来分析人类某一家系遗传病的发病情况。
Ⅰ
Ⅱ
Ⅲ
Ⅳ
3.遗传系谱题
根据遗传系谱图进行判断系谱图中“无中生有为隐性”,即双亲都没有患病而后代表现出的患病性状为隐性性状,如图5-14-6中甲所示,由该图可以判断白化病为隐性性状;
系谱图中“有中生无为显性”,即双亲都患病而后代出现没有患病的个体,患病性状为显性性状,如图5-14-6中乙所示,由该图可以判断多指是显性性状。
图5-14-6
例题:多指是一类由常染色体上的遗传因子控制的人类遗传病.已知某女患者的家系图,试回答下列问题(设A、a是与该病有关的遗传因子):
显
Aa
2/3
AA、Aa、aa
(1)据图谱判断,多指是由______性遗传因子控制的遗传病.
(2)写出Ⅲ中女患者及其父母所有可能的遗传因子组成:女患者______,父亲______,母亲______.
(3)如果该女患者与多指男患者结婚,其后代所有可能的遗传因子组成是______.
(4)如果该女患者与一正常男子结婚,其后代患多指的概率为______.
Aa
Aa或AA
1、根据题意,画出便于逻辑推理的图解;
2、根据性状分离,判断显、隐性性状;
3、根据性状表现初步确定遗传因子组成;
(隐性性状— dd,显性性状— Dd或DD→D_ )
4、根据性状分离比(根据后代表现型、遗传因子组成),判断双亲遗传因子组成;
5、弄清有关配子的遗传因子及比例;
6、利用配子比例求相应个体概率。
小结:遗传题解题步骤
思维训练
假设你正在一个花卉生产基地工作。有一天,你突然发现一种本来开白花的花卉,出现了开紫花的植株。你立刻意识到它的观赏价值,决定培育这样的花卉新品种。当你知道这种花是自花传粉以后,将这株开紫花的植株的种子设计实验方案种下去,可惜的是,在长出的126株新植株中,却有36株是开白花的,这当然不利于商品化生产。怎样才能获得开紫花的纯种植株呢?请你写出解决这一问题的实验方案,与同学交流,看谁设计的方案更简捷。
①优良性状为_______性状时,一旦出现就能稳定遗传,便可留种推广。
②优良性状为显性性状时,连续自交多代,选种,留种推广。
分离定律的应用
1.指导育种
隐性
若Aa连续自交n代,会出现怎样的结果?
自交
自交
自交
Aa × Aa
自交
P
F1
F2
Aa连续自交n代,结果如下:
F2
自交
自交
自交
F3
自交n代
Fn
1.指导育种
Aa概率 纯合子概率
Aa连续自交n代,结果如下:
Aa连续自交多代,
①Aa的概率趋近0
②AA或aa的概率趋近½
③纯合子的概率趋近1
AA或aa
纯合子
Aa
思维训练
假设你正在一个花卉生产基地工作。有一天,你突然发现一种本来开白花的花卉,出现了开紫花的植株。你立刻意识到它的观赏价值,决定培育这样的花卉新品种。当你知道这种花是自花传粉以后,将这株开紫花的植株的种子设计实验方案种下去,可惜的是,在长出的126株新植株中,却有36株是开白花的,这当然不利于商品化生产。怎样才能获得开紫花的纯种植株呢?请你写出解决这一问题的实验方案,与同学交流,看谁设计的方案更简捷。
将获得的紫花植株连续自交几代,即将每次自交后代的紫花植株选育后再进行自交,直至自交后代中不再出现白花植株为止。
思维训练
自交
F1
F2
紫花
紫花
紫花
白花
选育紫花
自交
淘汰
×
紫花
白花
选育紫花
自交
淘汰
直至不再出现白花植株为止
2.指导人类遗传病的预防
遗传系谱图
显性遗传病
隐性遗传病
计算方法:用分离比直接计算、用配子的概率计算
但当亲代基因型未确定的情况下,难度会加大,计算后代某一性状的概率可以参照以下方法:
首先确定亲本可能的遗传因子组成(基因型)及其概率;
算出亲本产生的配子类型及其概率,再按配子结合形成受精卵来算后代基因型及其概率;或列出两个亲本所有可能的组合及其概率,分别算出各种组合的后代及其比例,然后再综合分析后代的基因型及其比例。
例.以下是某家族某种遗传病的系谱图,根据所学知识回答问题。(相关基因用A、a表示)
(1)该遗传病由____性基因控制。
(2)Ⅰ3、Ⅱ6的基因型为:________和_________。
隐
Aa
AA或Aa
(3)Ⅰ1与Ⅰ2再生两个孩子,一个正常一个患病的概率为:_________。
3/8
(4)Ⅱ6与Ⅱ7生出患病孩子的概率为:________。
1/9
习题巩固
一、概念检测
1.在孟德尔的一对相对性状的豌豆杂交实验中,F1 都表现为显性性状,F1 的自交后代却出现了性状分离。据此判断下列相关表述是否正确。
(1)隐性性状是指生物体不能表现出来的性状。 ( )
(2)纯合子的自交后代不会发生性状分离,杂合子的自交后代不会出现纯合子。 ( )
×
×
习题巩固
A
2.人眼的虹膜有褐色的和蓝色的,褐色是由显性遗传因子控制的,蓝色是由隐性遗传因子控制的。已知一个蓝眼男人与一个褐眼女人(这个女人的母亲是蓝眼)结婚,这对夫妇生下蓝眼孩子的可能性是 ( )
A.1/2 B.1/4 C.1/8 D.1/6
习题巩固
3.观察羊的毛色遗传图解,据图回答问题。
(1)毛色的显性性状是 __________,隐性性状是 ___________。
(2)白毛羊与白毛羊通过有性生殖产生的后代中出现了黑毛羊,这种现象在遗传学上称为___________________。产生这种现象的原因是
_______________________________________________________。
白色
黑色
性状分离
白毛羊为杂合子,杂合子自交时会出现性状分离。即雌雄白毛羊均可形成含有黑毛遗传因子的配子,雌雄配子随机结合,会产生黑毛羊。
习题巩固
2.某农场养了一群马,马的毛色有栗色和白色两种。已知栗色和白色分别由遗传因子 B 和 b控制。育种工作者从中选出一匹健壮的栗色公马,拟设计配种方案鉴定它是纯合子还是杂合子(就毛色而言)。请回答下列问题。
(1)在正常情况下,一匹母马一次只能生一匹小马。为了在一个配种季节里完成这项鉴定,应该怎样配种?
将被鉴定的栗色公马与多匹白色母马配种
(2)杂交后代可能出现哪些结果?如何根据结果判断栗色公马是纯合子还是杂合子?
一是杂交后代全部为栗色马,此结果说明被鉴定的栗色公马很可能是纯合子;二是杂交后代中既有白色马,又有栗色马,此结果说明被鉴定的栗色公马为杂合子。
习题巩固
3.孟德尔说 :“任何实验的价值和效用,取决于所使用材料对于实验目的的适合性。”结合孟德尔的杂交实验,谈谈你对这句话的理解。
选择适宜的实验材料是确保实验成功的条件之一。孟德尔在遗传杂交实验中,曾使用多种植物如豌豆、玉米、山柳菊做杂交实验,其中豌豆的杂交实验最为成功,因此,他发现了遗传规律。这是因为豌豆具有适于研究杂交实验的特点。例如,豌豆严格自花传粉,在自然状态下是纯种,这样确保了通过杂交实验可以获得真正的杂种;豌豆花大,易于做人工杂交实验;豌豆具有稳定的易于区分的性状,便于观察和统计实验结果。
习题巩固
4.除了孟德尔的杂交实验,你还能举出科学研究中运用假说—演绎法的实例吗?
觊库勒提出苯分子的环状结构、原子核中含有中子和质子的发现过程等,都是通过假说一演绎法得出结论的。19世纪以前科学家对遗传学的研究,多采用从实验结果出发提出某种理论或学说。而假说一演绎法,是从客观现象或实验结果出发,提出问题,作出假设,然后设计实验验证假说的研究方法,这种方法的运用促进了生物科学的研究,使遗传学由描述性研究入理性推导和实验验证的研究阶段。
Lavf58.20.100
Codec by Bilibili XCode Worker v4.8.78(fixed_gap:False)
0310601010227/coverImage.png
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0310601010227/meta.json
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.titlepanel-point{background-color:#383847;border:1px solid hsla(0,0%,100%,.82)}.dark .move_ico{background:#70707a}.dark .control-panel{background-color:#383847;color:#fff}.dark .subject_logo_container,.dark .widget_detail_container{background:#404052}.dark .widget_detail_title{color:#fff}.dark .widget_detail_summary{color:#fff;opacity:.42}.dark .widget_operation_share,.dark .widget_tool_container{background:#404052}.dark .share_tip{opacity:.72;color:#fff}.dark .widget_detail_container_box{background:#404052}@media screen and (max-width:1200px){.control-panel{border-radius:12px}#widgetTitle{font-size:18px;top:24px;left:24px}#widgetSubTitle{font-size:14px;line-height:18px;top:48px;left:24px}.titlepanel-point{background:#fff;border:0 solid rgba(0,0,0,.04);-webkit-box-shadow:0 2px 10px 0 hsla(0,0%,53.7%,.12);box-shadow:0 2px 10px 0 hsla(0,0%,53.7%,.12)}.point-size{width:48px!important;height:48px!important}.title-logo{width:27px;height:27px;background-image:url(data:image/png;base64,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);background-size:27px 27px}.titlepanel_left{left:24px;top:calc(100% - 24px)}.titlepanel_right{left:calc(100% - 24px);top:calc(100% - 24px)}}@media screen and (min-width:1200px) and (max-width:1800px){.control-panel{border-radius:13px}#widgetTitle{font-size:24px;top:32px;left:32px}#widgetSubTitle{font-size:18px;line-height:20px;top:66px;left:32px}.titlepanel-point{background:#fff;border:1px solid rgba(0,0,0,.04);-webkit-box-shadow:0 3px 15px 0 hsla(0,0%,53.7%,.12);box-shadow:0 3px 15px 0 hsla(0,0%,53.7%,.12)}.point-size{width:72px!important;height:72px!important}.title-logo{width:40px;height:40px;background-image:url(data:image/png;base64,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);background-size:40px 40px}.titlepanel_left{left:32px;top:calc(100% - 32px)}.titlepanel_right{left:calc(100% - 32px);top:calc(100% - 32px)}}@media screen and (min-width:1800px){.control-panel{border-radius:21px}#widgetTitle{font-size:32px;top:36px;left:36px}#widgetSubTitle{font-size:22px;line-height:25px;top:80px;left:36px}.full-panle-size{width:312px;height:354px;border-radius:21px}.move_bar{height:36px}.titlepanel-point{background:#fff;border:1px solid rgba(0,0,0,.04);-webkit-box-shadow:0 4px 20px 0 hsla(0,0%,53.7%,.12);box-shadow:0 4px 20px 0 hsla(0,0%,53.7%,.12)}.point-size{width:96px!important;height:96px!important}.title-logo{width:53px;height:53px;background-image:url(data:image/png;base64,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);background-size:53px 53px}.widget_title{margin-left:16px;margin-top:11px;font-size:22px;line-height:22px}.widget_detail_container{padding-left:16px;margin-top:10px;width:281px;height:55px}.widget_detail_container_box .widget_detail_summary{font-size:18px}.widget_detail_summary{width:280px;font-size:18px;line-height:27px}.widget_operation_container{margin-top:20px;padding-left:13px;padding-right:13px}.operation_container_margin{margin-top:16px}.widget_operation_share{width:138px;height:55px;padding-left:24px}.share_tip{font-size:14px;line-height:16px}.widget_tool_container{width:88px;height:75px;padding-top:16px;padding-bottom:10px}.widget_note{margin-top:21px;margin-bottom:21px;padding-left:47px;padding-right:47px;font-size:13px;line-height:13px}.icon-center{margin:0 auto}.icon-block,.icon-center{width:20px;height:20px;background-size:20px 20px;background-repeat:no-repeat}.tool_tip{font-size:14px;line-height:16px;margin-top:8px}.right-arrow-position{bottom:10px;right:-16px}}
/* !*height: 17px;*!*/
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