In chickens, feathered legs dominate over naked ones, a pink-shaped ridge – over a simple one.

In chickens, feathered legs dominate over naked ones, a pink-shaped ridge – over a simple one. A hen with bare legs and a simple comb was crossed with a rooster with feathered legs and a pink comb. It is known that the rooster is the offspring of a hen with bare legs and a rooster with a simple comb. A) How many types of gametes does a chicken produce? B) How many types of gametes does a rooster produce? Q) How many different phenotypes will result from this crossing? D) How many different genotypes will result from this crossing? E) Estimate the likelihood that some of the chicks will look like a mother hen. E) What is the probability of having two chickens in a row with bare legs and a simple comb?

R: aabb (chicken) x AaBb (rooster) – parent individuals;

G: ab x AB, Ab, aB, ab – possible gametes, from a chicken one type of gametes, from a rooster 4;

F: AaBb – 25% feathered, legs are pink-shaped;

Aabb – 25% feathered, legs with a simple crest;

aaBb – 25% bare legs, pink-shaped crest;

aabb – 25% bare legs, legs with a simple comb.

Crossing resulted in 4 genotypes and 4 phenotypes.

The probability of giving birth to a chicken that looks like its mother is 25%. The probability of giving birth to such chickens twice in a row is 6.25% (25% * 25%).