In: Biology
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.