Practice - two traits Bio2 1 kam.pdf - Name Date: Genetic Crosses ... - Free Printable

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1. The phenotypes corresponding to the given genotypes are:
- BB: black
- Bb: black
- bb: white

2. In a cross between two heterozygous (Bb) rabbits, the Punnett square yields:
- Genotype ratio: 1 BB : 2 Bb : 1 bb
- Phenotype ratio: 3 black : 1 white

3. In a cross between a homozygous dominant (BB) rabbit and a heterozygous (Bb) rabbit, the Punnett square yields:
- Genotype ratio: 1 BB : 1 Bb
- Phenotype ratio: 4 black : 0 white (all offspring are black)

4. In a cross between a heterozygous (Bb) rabbit and a homozygous recessive (bb) rabbit, the Punnett square yields:
- Genotype ratio: 1 Bb : 1 bb
- Phenotype ratio: 1 black : 1 white

5. To produce offspring that are all white (bb), both parents must contribute a 'b' allele. Therefore, both parents must have the genotype bb.

Parent Tip: Review the logic above to help your child master the concept of genetic crosses worksheet answer key.

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