Question

can i get help with these 2 problems?

In the yawncat (a rare hypothetical animal), the black coat color allele B is dominant to the brown allele b, but the B locus can only be expressed if the animal has an mm genotype at a second gene locus. Animals that are M_are yellow regardless of which allele from the B locus is present. a. A mating between a yellow-tailed male yawncat and a brown-tailed female yawncat produces 16 offspring with the following tail phenotypes: 8 yellow 4 black 4 brown What are the genotypes of the parents and the offspring in this cross? b. What type of epistasis is displayed by the coat color genes in yawncats? c. A third locus, R, determines whether the tail will be solid or have white spots; the dominant allele R causes solid tail color, and the recessive allele r results in white spots on a colored background. What is the tail phenotype of yawncats with the following genotypes? i. BBmmrr ii. BbMmRr iii. bbmmer

Answer 1

The genotypes of parents will be Bbmn (@yellow railed male) bbmm ( Brown-tailed jemale) It is showing Dominant epistasis Here the dominant allele of one gene masks the effect of either allele of the second gene, is given plo problem the 'm locus is said to be epistatic to Blocus Phenotype of yawncats with the following genotype i, BBmmor Black tailed with white spots Bb Mm Ro - Yellow & solid tail color Brown tailed with white spots. his bbmmor

Genotypes of parental birds-bbaa HH - white bb AA hh-white bbaa HH x bb AA hh Gamels bah) Ah fi - bb Aakh orange parental genotype - Bb Aath - blue - Bb A anh - blue рь Ад и х дЬАа и BAH BAW Bal Bath BAN BAW Bal Ball в Бъ5 (Бай(bah) БАН БА (ban (ban of pring gemo hype for Black - BBAANM of Homozygous dominant Bwith dominant either the Donunant ARH allele for Blue - heterozygou Bb with either of the Dominant BA & Hallele for crange - sellestre Bbb with either of the Dominant a&u allele for white - dous A&u reeenne ie 40 BBoa HH, Bb Ahhh, bb a hy, Baahh, Baahh Enample bb A Ahh all are white, of Recessive epistasis c)