If a black coat that is coat dominant over a red coat but is heterozygousfor coat color and breeds with a red cow, what percentage of their offsprings would be black coat
Br with rr
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To determine the percentage of their offspring that would have a black coat, we need to consider the principles of Mendelian genetics.
Since the black coat is coat dominant over red, an individual with the genotype "Bb" (where 'B' represents the black coat allele and 'b' represents the red coat allele) would have a black coat.
Let's consider the parents:
- The black coat parent is heterozygous for coat color (Bb).
- The red coat parent would be homozygous for the red coat allele (bb).
To determine the possible genotypes and corresponding phenotypes of the offspring, we need to perform a Punnett square analysis:
| Bb | bb |
-------+-----------+-----------+
Bb | BB | Bb |
-------+-----------+-----------+
bb | Bb | bb |
-------+-----------+-----------+
From the Punnett square, we can see that 50% of the offspring will have a black coat (genotype Bb) while the other 50% will have a red coat (genotype bb).
Therefore, the percentage of their offspring with a black coat would be 50%.
To determine the percentage of offspring with a black coat, we need to understand the principles of genetic inheritance and the specific pattern of coat color inheritance in cows.
In this case, let's assign the letter B to represent the dominant black coat color allele and the letter b to represent the recessive red coat color allele. Since the black coat color gene is dominant over the red coat color gene, Bb would represent a black coat cow, and bb would represent a red coat cow.
Given that the black coat cow is heterozygous for coat color (Bb), and the red cow is homozygous for the red coat color allele (bb), we can use Punnett squares to calculate the possible genotypes and phenotypes of the offspring.
The Punnett square for a Bb x bb cross would look like this:
| B | b |
------------------
B | BB | Bb |
------------------
b | bB | bb |
From the Punnett square, we can see that 50% of the offspring would have a black coat (Bb) and 50% of the offspring would have a red coat (bb). Therefore, if a black coat cow that is heterozygous for coat color (Bb) is bred with a red coat cow (bb), 50% of their offspring would be black coat.
It's worth noting that this calculation is based on the assumption that coat color is solely determined by the B and b alleles and that there are no other genetic factors influencing coat color.