White Feather
domesticated hens with white feather and large , single combs mate with rooters that have dark feathers and?
small combs. All the offspring resemble their mothers for both traits. A) which allels of each trait are dominant and which are recessive? B) if the F1 were crossed with each other , what percetage of the F2 would be expected to have dark feathers and large, single combs?
A. Traits appearing in F-1 generation are dominant traits.
Thus, White (W) feathers are dominant over Dark (w) type. And, Large (L) combs are dominant over small (l) combs.
Thus, Genotype of all (male) roosters is wwll
Since only dominant trait is apparent in F-1 Genertion, hens are homzygous (pure breed) for both traits.
(If hen was heterozygous for both traits, we would get 25% of each phenotype combination in F-1 generation)
Thus, Genotype of (parent generation) hen (i.e. female) is WWLL
Gametes produced by Hen- WL and Rooster- wl
F-1 Generation- WwLl (Heterozygous Dominant for both traits)
Gametes produced- (4 types) WL, Wl, wL, wl
Cross them using punnett square,
F-2 Generation-
(White+Large) : (White+small) : (Dark+Large) : (Dark+small) = 9 : 3 : 3 : 1
Expected % of Dark Feathers, Large combs = 3/ 16 x 100 = 18.75%
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