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Question
A homozygous plant having round (R) and yellow (Y) seed is crossed with homozygous plant having wrinkled (r) and green (y) seeds: [5 MARKS]
(a) Give the scientific name of the plant on which Mendel conducted his hybridisation experiments.
(b) Give the genotype of the F1 generation.
(c) Give the dihybrid phenotypic ratio and the phenotype of the offspring of the F2 generation when two plants of the F1 generation are crossed.
(d) Name and state the law which explains the dihybrid ratio.
(e) Give the possible combinations of gametes that can be obtained from F1 hybrid.
(a) Give the scientific name of the plant on which Mendel conducted his hybridisation experiments.
(b) Give the genotype of the F1 generation.
(c) Give the dihybrid phenotypic ratio and the phenotype of the offspring of the F2 generation when two plants of the F1 generation are crossed.
(d) Name and state the law which explains the dihybrid ratio.
(e) Give the possible combinations of gametes that can be obtained from F1 hybrid.
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Solution
Each Part: 1 Mark
(a) Pisum sativum (sweet pea).
(b) 50% round yellow and 50% wrinkled green.
(c) 9:3:3:1
(d) Law of Independent Assortment: When there are two pairs of contrasting characters, the distribution of the members of one pair into the gametes is independent of the distribution of the other pair.
(e) All round and yellow seeds.
(a) Pisum sativum (sweet pea).
(b) 50% round yellow and 50% wrinkled green.
(c) 9:3:3:1
(d) Law of Independent Assortment: When there are two pairs of contrasting characters, the distribution of the members of one pair into the gametes is independent of the distribution of the other pair.
(e) All round and yellow seeds.
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