# PS01 - elongate 3 Given the pedigree below determine the...

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P ROBLEM S ET #1 D UE AT THE BEGINNING OF CLASS ON T HURSDAY 1 S EPTEMBER Y OU MUST SHOW ALL YOUR WORK TO RECEIVE CREDIT ! 1) Explain the statement: “Among the F2 progeny of a mono hybrid cross, the ratio of genotypes is 1:2:1, but among the progeny expressing the dominant phenotype, the ratio of genotypes is 1:2”. 2) In the summer squash, Curcurbita pepo , the shape of the fruit in wild type genotypes is a Frisbee- like flattened shape known as a disc. Either of two recessive mutations, when homozygous, result in sphere-shaped fruit. The double homozygous recessive genotype has a football-shaped fruit known as elongate. Assuming independent assortment, what ratio of disc:sphere:elongate would be expected in the F2 generation of a cross between homozygous disc and homozygous
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Unformatted text preview: elongate? 3) Given the pedigree below, determine the mode of inheritance of the trait and label individuals by sex and genotype (PP, Pp, pp, or P-). Explain your reasoning in determining mode of inheritance . 4) Given the pedigree below, determine the mode of inheritance of the trait, and label the individuals by sex and genotype (QQ, Qq, qq, Q-). Explain your reasoning in determining the mode of inheritance . Now, calculate the probability of observing the family of three unaffected children in generation III given their parents. Don’t forget to include the sex of the children in your calculation. If you want more practice, try these problems from the book: CH 1: 3, 4; CH 3: 1-5, 19-21, 24-27, 37...
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