crosses a heterozygous black rabbit with a homozygous white rabbit.
The genotype of offspring (give a number of each genotype) Phenotype of offspring (give the color of the phenotype(s))
The genotype of the offspring would be a mixture of black and white rabbits, depending on the dominance of the black color.
Possible genotypes of the offspring:
- 2 black rabbits (BB)
- 2 white rabbits (WW)
- 2 gray rabbits (BW)
The phenotype of the offspring would include both black and white rabbits.
- 2 black rabbits (black phenotype)
- 2 white rabbits (white phenotype)
- 2 gray rabbits (gray phenotype)
To determine the genotypes and phenotypes of the offspring, we need to understand the inheritance patterns of coat color in rabbits.
Let's assign the letter B to represent the dominant black allele and the letter b to represent the recessive white allele.
The heterozygous black rabbit would have the genotype Bb, meaning it carries one black allele (B) and one white allele (b).
The homozygous white rabbit would have the genotype bb, meaning it carries two white alleles (b).
Now, let's cross these two rabbits:
Bb (black) x bb (white)
When crossing a heterozygous black rabbit (Bb) and a homozygous white rabbit (bb), the offspring will inherit one allele from each parent, resulting in three possible genotypes: BB, Bb, and bb.
Using a Punnett square, we can determine the genotypes and phenotypes of the offspring:
| B | b
--------------
B | BB | Bb
--------------
b | Bb | bb
From the Punnett square, we can see that:
- 25% of the offspring will have the genotype BB (homozygous black)
- 50% of the offspring will have the genotype Bb (heterozygous black)
- 25% of the offspring will have the genotype bb (homozygous white)
As for the phenotypes:
- 75% of the offspring will have a black phenotype (either homozygous black or heterozygous black)
- 25% of the offspring will have a white phenotype (homozygous white)
So, to summarize:
Number of each genotype:
- BB (homozygous black): 25% of the offspring
- Bb (heterozygous black): 50% of the offspring
- bb (homozygous white): 25% of the offspring
Phenotype of offspring:
- Black: 75% of the offspring
- White: 25% of the offspring