In a hypothetical mammal quite prone to nondisjunction, red blood cell (rbc) sha

Question

In a hypothetical mammal quite prone to nondisjunction, red blood cell (rbc) shape is controlled by X-linked alleles. The following mating produced the offspring indicated below. In each case, indicate the sex chromosome genotype (R = normal round rbc shape, r = oval shape). From the list of choices, pick probable explanations for the occurrence of each type of offspring.
-----Female with equal numbers of round and oval rbcs
-----male with all round rbcs

a)female with all round rbcs
b)male with all oval rbcs
c) female with all oval rbcs
d) female with about 67% of the rbcs oval and 33% round
e) male with about 50% round and 50% oval rbcs

Explanation / Answer

XR Y-----male x xR xr-----Female GAMETES XR xr XR XR XR Female ALL round rbc XR xr Female round and oval rbcs Y Y XR male with all ROUND rbcs Y Xr male with all OVAL rbcs As male require one dose x-linked recessive allele for expression Where As female require double dose x-linked recessive allele for expression a)female with all round rbcs 25% b) male with all oval rbcs 25% c) female with all oval rbcs 0% d) female with about 67% of the rbcs oval and 33% round 0% e) male with about 50% round and 50% oval rbcs 0%

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