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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For English-medium practice in India. A4 paper is selected initially. Use short arithmetic sheets for revision and add your own lesson vocabulary to flashcards. These activities do not claim CBSE, ICSE or state-board alignment. A separate Hindi edition is available in the language selector.