In chickens, there is a mutant gene called "frizzle" that results in weak, stringy, and easily...

In chickens, there is a mutant gene called "frizzle" that results in weak, stringy, and easily broken feathers. When a frightfully frizzled fowl is bred to a normal chicken, the offspring are mildly frizzled. If one breeds two mildly frizzled chickens to each other, the offspring have the phenotypic ratio of normal: 2 mildly frizzled: 1 frightfully frizzled. Indicate the parent phenotypes and genotypes, and draw a punnett square for this cross.

Solutions

Expert Solution

It is given that on breeding frightfully frizzled fowl with normal chicken, mildly frizzled offspring is obtained. The mildly frizzled offspring must be a heterozygous (It receives one copy of each allele from both the parents and is an intermediate between extremely frizzled and normal chicken). Let the genotype of frightfully frizzled fowl be FF, and that of normal chicken be ff. When they are bred to each other, the genotype of the offspring will be Ff (mildly frizzled).

	F	F
f	Ff	Ff
f	Ff	Ff

So, the parents genotype and phenotype is ff (normal) and FF (frightfully frizzled).

Two mildly frizzled chickens are bred to each other. The cross between them is shown below-

	F	f
F	FF	Ff
f	Ff	ff

Thus, genotype and phenotype of the resulting offsprings are FF (frightfully frizzled), Ff (mildly frizzled) and ff (normal) and phenotypic ratio is 1 normal: 2 mildly frizzled: 1 frightfully frizzled.

gladiator answered 2 years ago

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