In the herd there were cows of black and red color. The bull had a black suit. All the calves that appeared in this herd were black
| May 22, 2020 | Education
In the herd there were cows of black and red color. The bull had a black suit. All the calves that appeared in this herd were black. Identify a recessive suit. What offspring will these calves be when they grow up?
Black color is dominant (A), the genotype of the bull is AA, because all calves are black without splitting. The genotype of red cows is aa, the genotype of black cows can be AA or Aa. The genotype of the descendants can be either AA or AA. If heterozygotes are crossed, then in F2 we get the splitting:
Aa x aa
F2 AA Aa Aa aa, i.e. 3: 1.
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