In rice plants the allele for high yield (H) is dominant over the allele for low yield (h) - NSC Life Sciences - Question 3 - 2016 - Paper 2
Question 3
In rice plants the allele for high yield (H) is dominant over the allele for low yield (h). The allele for a tall stem (T) is dominant over the allele for a short st... show full transcript
Worked Solution & Example Answer:In rice plants the allele for high yield (H) is dominant over the allele for low yield (h) - NSC Life Sciences - Question 3 - 2016 - Paper 2
Step 1
Give the phenotype of variety A.
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Answer
The phenotype of variety A is high yield and short stem.
Step 2
Give ALL the possible genotypes of the gametes of variety B.
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Answer
The possible genotypes of the gametes of variety B are hT and ht.
Step 3
Give the genotype(s) of the variety the plant breeder wants to produce.
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Answer
The genotype of the variety the plant breeder wants to produce is HHtt.
Step 4
Explain why the plant breeder would want to produce a rice plant with a short stem.
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Answer
The plant breeder would want to produce a rice plant with a short stem to prevent damage from wind and to facilitate easier harvesting.
Step 5
Describe how the plant breeder would be able to produce rice plants with a high yield and short stems only.
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Answer
The plant breeder can produce rice plants with high yield and short stems by crossing plants of variety A (HHtt) with plants of variety B (hhTT) to create hybrids. The resulting phenotypes can then be selected for high yield and short stem characteristics through generations of selective breeding.
