Assume that sex was determined in dinosaurs as it is in birds. That is, males we

Question

Assume that sex was determined in dinosaurs as it is in birds. That is, males were homogametic ZZ and female were heterogametric ZW. Assume that most duck-billed that a dinosaurs (Maiasaura peeblesorum, the Montana state fossil) were brown but dominant allele (B) at a locus on the Z-chromosome resulted in solid black coloration. What proportion of male progeny in a cross between a heterozygous black male (Bb) and a black female (BW) are expected to be black? a. 0 b.1/4 c. 1/2 d. 3/4 e. 1. What proportion of female progeny from the mating described in the previous question are expected to be black? a. 0 b. 1/4 c. 1/2 d. 3/4 e. 1

Explanation / Answer

9. Option D is the right answer. According to punnett square Bb male and BW female will make 3/4 black progeny. As the B allele is a dominant one so it will result in black coloration even in the heterozygous condition.

Bb×BW

BB, BW, BB, Ab.

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