Question

A black, short-horned bull mates with a cow with the same phenotype. All the progeny was black, but some had short horns, while others had longer horns. When the same bull mated with another cow, the progeny was either black or brown, but they all were short-horned. Also, from the latter mating, black, short-horned progeny were allowed to mate, and the offspring of this cross were either black or brown, with either short or long horns. Find the genotypes for the parents and demonstrate the crosses.

please explain in detail

Answer 1

1. A black, short-horned bull mates with a cow with the same phenotype.

BBHh x BBHh

BH, Bh, Bh, BH

	BH	Bh	BH	Bh
BH	BBHH	BBHh	BBHH	BBHh
Bh	BBHh	BBhh	BBHh	BBhh
Bh	BBHh	BBhh	BBHh	BBhh
BH	BBHH	BBHh	BBHH	BBHh

all black with some short horns(Hh or HH) and some with long horns(hh)

2. BbHH x BbHH

BH, bH, BH, bH

It will be crossed as above and the results obtained will be-

BBHH- Black with short horns

BbHH- Black with short horns

bbHH- Brown with short horns

3. black, short-horned progeny

BbHh x Bb Hh

BH, Bh, bH, bh

	BH	Bh	bH	bh
BH	BBHH	BBHh	BbHh	BbHh
Bh	BBHh	BBhh	BBHh	Bbhh
bH	BbHH	BbHh	bbHh	bbHh
bh	BbHh	Bbhh	bbHh	bbhh

9 black short horn

3 black long horn

3 brown short horn

1 brown long horn