生物高中必修2第二章第三节课件3.ppt

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1、Welcomesex-linkedinheritance伴性遗传achromatopsia(colorblindness)红绿色盲carrier携带者chromosome染色体phenotype表现型genotype基因型allele等位基因gamete配子offspring后代Daltonfoundthatonlyheandhisbrothersufferedfromcolorblindness.Sex-linkedinheritanceSex-linkedinheritance1、definition位于性染色体上的基因所控制的性状在遗传

2、上与性别相联系的遗传现象，称为伴性遗传。2、achromatopsiaXBXbY*控制红绿色盲的基因XBXBXBXbXBYXbXbXbYXBXbXB/XbXB/YXb/Yfemale,normalfemale,normalfemale,colorblindnessmale,normalmale,colorblindnessWhatarethephenotypesofnormalsenseofcolorandachromatopsiainhuman？Whatarethegametesthattheseindividualsproduce？*th

3、egenotypesandphenotypesofpeoplewhohavenormalsenseofcolorandcolorblindnessandrelevantgametes（carrier）Thereismoremalethanfemalewithcolorblindness.（红绿色盲的男性患者明显多于女性）*oneofthecharacteristicsoftheinheritanceincolorblindness（红绿色盲的遗传特点之一）*workoutproblemsbymeansofageneticdiagramXBXb

4、XBYPXBXbXBYXBXbXBYXBXBXBXbXbYgameteoffspringfemale,carriermale,normalfemale,normalfemale,normalmale,colorblindnessXBYmale,normalQuestion:Iftheyhaveason,theratiothattheboysuffersfromcolorblindnessis____%Iftheyhaveachild,theratiothataboysuffersfromcolorblindnessis____%*worko

5、utproblemsbymeansofageneticdiagram5025XBXbXbY（生一个男孩患病的概率）（生一个患病男孩的概率）female,carriermale,colorblindnessPXBXbXbYXBXbXbYXBXbXBYXbXbXbYfemale,normalfemale,normalmale,colorblindnessmale,normalgameteoffspringnormalfemalenormalmalefemalewithcolorblindnessmalewithcolorblindnessAbo

6、veisageneticpedigreeofcolorblindness.1)ThegenotypeofboyIII1is______,andthegenotypeofboyII2is_____.2)ThegenotypeofarelativeingenerationIwhoisrelatedtoboyIII1whohascolorblindnessis______,andtherelativeistheboy’s______________.IngenerationII,thegenotypeofaparentrelatedtoboyIII

7、1is_______,andthepersonistheboy’s______.XbYXbYgrandfatherXBXbmotherIIIIII1234121XBYThecolorblindnessgeneinmancomesuniquelyfromthemother,andissubsequentlytransmittedtothedaughter.Thecolorblindnessgeneinwomanistransmittedtosonordaughter.（男性的色盲基因肯定来自母亲，必然传给女儿。女性的色盲基因可能遗传给女儿或儿子

8、）*thesecondofthecharacteristicsoftheinheritanceincolorblindness（红绿色盲的遗传特点之二）Conclu