Work through each question. Show your reasoning where space is provided.
Name: ____________________ · Date: ____________
1. Cross aa × Aa. A is completely dominant over a; assume equal gamete probabilities and random fertilisation. What percentage of offspring is expected to show the recessive phenotype?
2. Cross AA × AA. A is completely dominant over a; assume equal gamete probabilities and random fertilisation. What percentage of offspring is expected to show the recessive phenotype?
3. Cross aa × aa. A is completely dominant over a; assume equal gamete probabilities and random fertilisation. What percentage of offspring is expected to show the recessive phenotype?
WorksheetWise · Standard · 1097
Monohybrid inheritance
Work through each question. Show your reasoning where space is provided.
Name: ____________________ · Date: ____________
4. Cross Aa × aa. A is completely dominant over a; assume equal gamete probabilities and random fertilisation. What percentage of offspring is expected to show the recessive phenotype?
5. Cross AA × Aa. A is completely dominant over a; assume equal gamete probabilities and random fertilisation. What percentage of offspring is expected to show the recessive phenotype?
WorksheetWise · Standard · 1097
Monohybrid inheritance — Answer key
Work through each question. Show your reasoning where space is provided.
1. Cross aa × Aa. A is completely dominant over a; assume equal gamete probabilities and random fertilisation. What percentage of offspring is expected to show the recessive phenotype?
50%
Four equally likely allele pairings: Aa, aa, Aa, aa. Only aa shows the recessive phenotype: 2/4 × 100 = 50%. This is a probability, not a guaranteed count.
2. Cross AA × AA. A is completely dominant over a; assume equal gamete probabilities and random fertilisation. What percentage of offspring is expected to show the recessive phenotype?
0%
Four equally likely allele pairings: AA, AA, AA, AA. Only aa shows the recessive phenotype: 0/4 × 100 = 0%. This is a probability, not a guaranteed count.
3. Cross aa × aa. A is completely dominant over a; assume equal gamete probabilities and random fertilisation. What percentage of offspring is expected to show the recessive phenotype?
100%
Four equally likely allele pairings: aa, aa, aa, aa. Only aa shows the recessive phenotype: 4/4 × 100 = 100%. This is a probability, not a guaranteed count.
WorksheetWise · Standard · 1097
Monohybrid inheritance — Answer key
Work through each question. Show your reasoning where space is provided.
4. Cross Aa × aa. A is completely dominant over a; assume equal gamete probabilities and random fertilisation. What percentage of offspring is expected to show the recessive phenotype?
50%
Four equally likely allele pairings: Aa, Aa, aa, aa. Only aa shows the recessive phenotype: 2/4 × 100 = 50%. This is a probability, not a guaranteed count.
5. Cross AA × Aa. A is completely dominant over a; assume equal gamete probabilities and random fertilisation. What percentage of offspring is expected to show the recessive phenotype?
0%
Four equally likely allele pairings: AA, Aa, AA, Aa. Only aa shows the recessive phenotype: 0/4 × 100 = 0%. This is a probability, not a guaranteed count.
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