Question

Answer and Explain Both! Thank You!

Two WVU alums decide to have kids. Assume that the male has a sister with cystic fibrosis (CF), (an autosomal recessive disease) and that he and both of his parents are normal. What is the probability that he is a CF carrier (heterozygote)? 2/3 1/3 1/4 о 3/4 12 Question 21 3 pts In Drosophila, nondisjunction during meiosis in the parent can result in flies with abnormal numbers of sex chromosomes. Flies with a single X and no Y are male, and those with XXY are female. Which of the following events could not give rise to a male with a single X in Drosophila? Nondisjunction at meiosis II in the female parent O O Nondisjunction at meiosis I in the male parent Nondisjunction at meiosis in the female parent All of these CAN give rise to a male with a single X in Drosophila Nondisjunction at meiosis II in the male parent

Answer 1

1. As cystic fibrosis is auto Somal vecessive disease Both the parents are normal it means both the þarents are heterozygoues So Genotype of both parents are Aa Aa Aa X AA Aa Aa Aa I Thiss will Normal cause the AA - Homozygous dominant Cystic fibrosis AQ - Heterozygous Porobability of Heterozygous cawien Pos a → disease. 3 Both parents are heterozygous then only has it is possible that daughten Cystic fibrosis. Option A Correct.