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Sex-Linked and Blood Types Challenge! MCP BIOLOGY 2012-2013 QUESTION 1 Hemophilia is a X-linked recessive disease. What would be the genotype for a normal female and male? ANSWER 1 Female: Male: H H X X H X Y QUESTION 2 Hemophilia is a X-linked recessive disease. Write a key for the five possible genotypes and phenotypes. ANSWER 2 H H X X – Normal female H h X X – Carrier female h h X X – Hemophiliac female H X Y – Normal male h X Y – Hemophiliac male QUESTION 3 Why does the Y allele not have a superscript? (little letter next to the Y) ANSWER 3 Because the Y chromosome contains much less genetic information QUESTION 4 Why must men always inherit a X-linked trait from their mother? ANSWER 4 Because to a be a male they always must receive father’s Y chromosome and can only receive an X chromosome from their mother QUESTION 5 What percent of offspring would have hemophilia if a women who was a carrier had children with a normal man. (Support your answer with a punnett square) ANSWER 5 25% H X h X H X Y h XY H H h H H X XX XX Y QUESTION 6 In Drosophila (fruit flies) red eyes are X-linked and dominate to white eyes. What percent of offspring would have red eyes if a homozygous dominate female mated with a white eyed male? ANSWER 6 100% R X R X R XY R XY r R r R r X XX XX Y QUESTION 7 A form of Muscular Dystrophy (loss of muscle tissue)is a Xlinked recessive disease. What percent of offspring would have the disease if a carrier female mated with a man who had the disease. ANSWER 7 50% M X m X M X Y m X Y m m m M m X X X X X Y QUESTION 8 Red-green color blindness is a X-linked recessive trait. What would be the genotype of the parents if they had a 50% chance of normal sons and 50% chance of carrier daughters? (Must draw punnett square) ANSWER 8 Dad - XbY Mom - XBXB b B b B b X XX XX Y B XY B XY QUESTION 9 Vinny, a colorblind person got married, divorced, and remarried. He and his first wife, Ryder, has a colorblind son, a colorblind daughter, a normal son and a normal daughter. He and his current wife, Snooki, have four boys and two girls, none of whom are colorblind. (Make a punnett square for Vinny and each wife) ANSWER 9 Vinny x Ryder C c X X C c c c c X X XX X Y C XY c XY Vinny x Snooki QUESTION 10 Hairy ears is inherited as a Y-linked recessive trait. A man with hairy ears marries a woman with normal ears. Draw a Punnett square of the possible offspring. Could any of their children have hairy ears? ANSWER 10 50% X h Y X X XX XX h XY h XY MAURY MAURY MAURY!!! When it comes to 4 year old Chris, You are ________________ the FATHER!!! QUESTION 11 Ayanie with blood type IAIB marries Roderige with blood type O or ii. They child has blood type O or ii. Is this man the child’s father? QUESTION 12 A woman with blood type A or IAi marries a man with blood type B or IBi. They child has blood type O or ii. Is this man the child’s father? QUESTION 13 A child with blood type AB or IAIA is born to a mother with blood type B or IBIB and father with blood type IAi. Is this man the father?