In cattle, hornlessness (hornlessness) dominates horniness. What offspring can be expected from breeding hornless
| December 19, 2020 | education
In cattle, hornlessness (hornlessness) dominates horniness. What offspring can be expected from breeding hornless and horned cows? If it is known that one of the cows brought a horned calf from this bull.
Given:
A-hollow
a-horniness
Find: F1-?
Decision:
Horned cow genotype – ♀️aa
A hornless bull can be ♂️AA or ♂️Aa
Let’s consider both options:
Option 1
P: ♂️AA and ♀️aa
G: A * a
F1: A- 100% polished
Option 2
R: ♂️Aa and♀️aa
G: A a * a
F1: A- 50% hornless
aa – 50% horned
Because by condition it is known that earlier this bull had horned calves, which means the genotype of the bull is Aa
Correct option number 2
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