please provide explanantion in a hypothetical mammal quite prone to nondisjuncti

Question

please provide explanantion


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

Possible explanations in the parent
a) Normal male meiosis, normal female meiosis
b) Normal male meiosis, anaphase I nondisjunction in female meiosis
c) Normal male meiosis, anaphase II nondisjunction in female meiosis
d) normal female meiosis, anaphase I nondisjunction in male meiosis
e) normal female meiosis, anaphase II nondisjunction in male meiosis

Explanation / Answer

b) Normal male meiosis, anaphase I nondisjunction in female meiosis

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