please help Genetics: Q1) The frizzle fowl is much admired by poultry fanciers.
ID: 56184 • Letter: P
Question
please help
Genetics:
Q1) The frizzle fowl is much admired by poultry fanciers. It gets its name from the unusual way that its feathers curl up, giving the impression that it has been (in the memorable words of animal geneticist F. B. Hutt) “pulled backwards through a knothole.” Unfortunately, frizzle fowl do not breed true: when two frizzles are intercrossed, they always produce 50 percent frizzles, 25 percent normal, and 25 percent with peculiar woolly feathers that soon fall out, leaving the birds naked.
A) Give a genetic explanation for these results, showing genotypes of all phenotypes, and provide a statement of how your explanation works.
B) If you wanted to mass-produce frizzle fowl for sale, which types would be best to use as a breeding pair?
Explanation / Answer
* The feather characteristics of frizzle fowl are due to heterozygous condition for the gene which shows incomplete dominance. Suppose, the dominant allele is F and the other allele is f
Parents
genotype
F
f
F
FF
(normal)
Ff
(frizzle)
f
Ff
(frizzle)
ff
(over frizzle)
* FF genotype are normal fowl
* Ff are heterozygous in which the allele shows incomplete dominance
* ff are recessive and are over frizzle
B) For mass production of frizzle fowl, a normal fowl shall be crossed with a homozygous recessive with wooly feathers. All the progeny will be heterozygous and are frizzle.
Parents
genotype
F
f
F
FF
(normal)
Ff
(frizzle)
f
Ff
(frizzle)
ff
(over frizzle)
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