Need help on all these questions Chapter15-conceptCheckQuestions? 1. Morgan and

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Need help on all these questions Chapter15-conceptCheckQuestions? 1. Morgan and his colleagues worked out a set of symbols to represent fly genotypes. Which of the following is representative? a) AaBb x AaBb b) 46 or 46w d) "2x '3 In some species of Drosophila, there are genes on the Y chromosome that are not on the X ch 2. romosome. Imagine that a new allele arises on the Y chromosome and reduces the size by half of individ situation? a) This allele is passed to all offspring of a male with the allele. uals with the new allele. Which of the following statements is accurate with regard to this b) This allele is passed to all male but no female offspring of a male with the allele. c) This allele is passed to all offspring of a female with the allele. d) This allele is passed to all male but no female offspring of a female with the allele. e) This allele is passed to all offspring of both males and females with the allele. 3. In Drosophila, white eyes are due to an X-linked recessive allele (X). Which of the following crosses could not result in a white-eyed Drosophila male? a) homozygous red-eyed females with white-eyed males b) homozygous white-eyed females with red-eyed males c) heterozygous red-eyed females with white-eyed males d) heterozygous red-eyed females with red-eyed males

Explanation / Answer

1-C

2-B

3-A

Note - homozygous red fly will have both red allele on x chromosome and since male take thier c from mother the male with red homozygous mother will also be red allele and no white allele in genotype .

The y chromosome is passed to male from father and it has nothing to do with the daughters .

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