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4.23 Monohybrid inheritance diagrams
Exam question
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In guinea pigs, black fur (B) is dominant to white fur (b). Two heterozygous guinea pigs are crossed. Draw a genetic diagram to show the offspring genotypes and phenotypes.
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Total for this question: 4 marks
4.23 Monohybrid inheritance diagrams
Exam question
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A homozygous black guinea pig (BB) is crossed with a white guinea pig (bb). Draw a genetic diagram to show the offspring.
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Total for this question: 3 marks
4.23 Monohybrid inheritance diagrams
Exam question
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What is the expected phenotype ratio from Tt × tt?
(1)Total for this question: 1 mark
4.23 Monohybrid inheritance diagrams
Exam question
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Explain why a Punnett square is used.
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Total for this question: 2 marks
4.23 Monohybrid inheritance diagrams
Exam question
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Explain why observed ratios often differ from expected ratios.
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Total for this question: 2 marks
4.23 Monohybrid inheritance diagrams
Exam question
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A cross between two heterozygous plants gave 302 tall and 98 short plants. Calculate the ratio of tall to short.
(2)Total for this question: 2 marks
4.23 Monohybrid inheritance diagrams
Exam question
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In cats, the allele for short hair (H) is dominant to long hair (h). A short-haired cat and a long-haired cat have 4 short-haired and 3 long-haired kittens. Explain what this shows about the short-haired parent.
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Total for this question: 3 marks
4.23 Monohybrid inheritance diagrams
Exam question
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State the genotypes of the gametes made by a parent with genotype Ff.
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Total for this question: 2 marks
4.23 Monohybrid inheritance diagrams
Exam question
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Predict the phenotype ratio of offspring from Rr × RR where R is dominant.
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Total for this question: 2 marks
4.23 Monohybrid inheritance diagrams
Exam question
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Complete a genetic diagram to show the cross between two carriers of cystic fibrosis (Ff × Ff), and state the proportion of children expected to have cystic fibrosis.
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Total for this question: 3 marks
4.23 Monohybrid inheritance diagrams
Exam question
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Explain why genetic diagrams show gametes in circles.
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Total for this question: 2 marks
4.23 Monohybrid inheritance diagrams
Exam question
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Suggest why breeders keep crossing animals for several generations.
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Total for this question: 2 marks
4.23 Monohybrid inheritance diagrams
Exam question
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Illustrative data.
| Cross | Purple flowers | White flowers |
|---|---|---|
| 1 | 78 | 26 |
| 2 | 51 | 49 |
| 3 | 100 | 0 |
Purple (P) is dominant to white (p). Deduce the parent genotypes for crosses 1, 2 and 3.
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Total for this question: 3 marks
4.23 Monohybrid inheritance diagrams
Exam question
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| Cross | Purple flowers | White flowers |
|---|---|---|
| 1 | 78 | 26 |
| 2 | 51 | 49 |
| 3 | 100 | 0 |
Explain why cross 3 gives no white flowers.
(2)Write your answer, then press Show model answer and tick each mark point your answer makes. Your answer is not saved.
Total for this question: 2 marks
