10. Three points: Suppose gene B is X-linked and is embryonically lethal when ho

Question

10. Three points: Suppose gene B is X-linked and is embryonically lethal when homozygous or hemizygous recessive. A ma kids. Using a Punnett square, answer the following a. What is the probablity that they will have a son that dies before birth? b. What is the probability that they will have a daughter that dies before birth? c. One of their daughters eventually has a child with a man. One of their sons dies before birth. n marries a woman who is heterozygous for this gene. They have four yme What was the genotype of this daughter? d I

Explanation / Answer

XY x XbX = 4 offsprings.

a) probability of having a son = 1/2 (50%) and probability of son died before birth =1/2 (50%)

so overall probability of son died before birth = 1/2 x 1/2 =1/4 (25%).

b) the daughter will not die she will be a carrier. because it is lethal in the homozygous and hemizygous condition not in heterozygous condition.

c) the genotype of the daughter is same as her mother XbX.

Xb X X XbX XX Y XbY XY

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