Use the five Punnett square steps to answer this problem.
Two heterozygous black mice are crossed. What percentage of their offspring would have white fur? In these mice,
black fur color is dominant over white.
Father
Mother
| e | B | b |
|---|---|---|
| B | ||
| bb |
- Draw and label Punnett square with parent genotypes
- Use parent genotypes to find each box’s genotype
- Determine genotypic percentages and ratios
- Use dominance to determine phenotype in each box
- Determine phenotypic percentages and ratios
What percentage of their offspring would have white fur?
B
b
B
b
BB
Bb
Bb
bb
| BB | Bb | bb | ||
|---|---|---|---|---|
| : | : |
| black | white | |
|---|---|---|
| : |
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