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Feather Color in Chickens Is the Result of an Incompletely

Question 28

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Feather color in chickens is the result of an incompletely dominant gene. The gene responsible for black feathers (B) when homozygous results in a muted color called "Andalusian blue" if combined with an allele for white feathers (b). When the white allele occurs in homozygous conditions, a white phenotype results. A gene affecting comb shape (R), which results in a comb called a "rose" comb, is completely dominant over (r), which in homozygous conditions results in a comb called "single." A mating between a black single rooster and white rose hen results in a number of chicks, all of which have identical phenotypes.
-Use a Punnett square to demonstrate a cross between two of the F1 offspring.What are the phenotypes and ratios that occur?

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6 blue rose (B/b R/-): 3 black...

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