crosses a heterozygous black rabbit with a homozygous white rabbit.
B b
B
b
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 can be determined by combining the alleles from the parents.
When a heterozygous black rabbit (Bb) is crossed with a homozygous white rabbit (bb), the possible outcomes of the offspring's genotypes are as follows:
- 50% of the offspring will inherit the allele B from the heterozygous black rabbit and the allele b from the white rabbit, resulting in the genotype Bb.
- The other 50% of the offspring will inherit the allele b from both parents, resulting in the genotype bb.
Therefore, the genotypes of the offspring would be:
- 50% Bb
- 50% bb
The phenotype of the offspring can be determined based on their genotypes.
In rabbits, the B allele represents black color, while the b allele represents white color.
Considering the genotypes of the offspring from the previous calculation, the corresponding phenotypes would be:
- 50% of the offspring with the genotype Bb will express the black color phenotype.
- The remaining 50% of the offspring with the genotype bb will express the white color phenotype.
Therefore, the phenotypes of the offspring would be:
- 50% black
- 50% white.
To determine the genotypes and phenotypes of the offspring, we need to use Punnett squares. Let's fill in the Punnett square based on the information provided:
| B | b |
-------------------------------
B | BB | Bb |
------------------------
b | Bb | bb |
Therefore, the possible genotypes of the offspring are:
1. BB (homozygous black): This genotype occurs when a black rabbit (BB) mates with a white rabbit (bb).
2. Bb (heterozygous black): This genotype occurs when a black rabbit (BB) mates with a white rabbit (Bb).
The possible phenotypes of the offspring are:
1. Black: This phenotype occurs when the genotype is BB or Bb.
2. White: This phenotype occurs when the genotype is bb.
So, there will be 1 homozygous black rabbit (genotype: BB), 2 heterozygous black rabbits (genotype: Bb), and 1 homozygous white rabbit (genotype: bb) in the offspring.