Practice problems 1ans

Practice problems 1ans - Practice problems (with answers)...

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Practice problems (with answers) 1. Calico cats have patches of black and orange fur, and are heterozygous for the orange and black alleles of a coat color gene. A calico cat named Furball had a father with black fur. What sex chromosome did Furball inherit from its father? Explain your reasoning. Furball inherited an X chromosome from her father. Because furball is a Calico and thus a mosaic, she has two X chromosomes and is a female. Therefore she must have inherited an X from both parents. Describe the mechanism that results in Furball’s patches of black and orange fur. X inactivation. Early in Furball’s development, each cell inactivated an X chromosome. Those cells that inactivated the X chromosome containing the orange allele and gave rise to fur producing cells generated black fur. Those cells that inactivated the X chromosome containing the black allele and gave rise to fur producing cells generated orange fur. Much to your surprise, Furball karyotype reveals that it is XXY. How would this finding affect the answers to the previous questions? Furball is a male because he has a Y chromosome, and he would have inherited a Y from his father. He could have inherited the extra X from either his father or mother. The answer to the second part is the same. If you know that Furball inherited two X chromosomes from mom, can you predict the fur phenotype of Furball’s mother? Yes. She would be a calico. 2. DNA polymorphisms on the Y chromosome and on mtDNA have been used extensively to study the history in humans. Describe some of the advantages that these chromosomes have over autosomes for these types of studies.
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Practice problems 1ans - Practice problems (with answers)...

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