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Two gene loci that control red seed colour in wheat have the following alleles - VCE - SSCE Biology - Question 11 - 2010 - Paper 1
Question 11
Two gene loci that control red seed colour in wheat have the following alleles. Gene locus 1: R₁ type: red colour R₁ type: no colour Gene locus 2: R₂ type: re... show full transcript
Worked Solution & Example Answer:Two gene loci that control red seed colour in wheat have the following alleles - VCE - SSCE Biology - Question 11 - 2010 - Paper 1
Step 1
A. a plant with the genotype R₁ type R₂ type R₁ type R₂ type could be a parent of a seed with the darkest red colour.
Answer
This statement is not reasonable. The darkest red colour in seeds would likely come from a plant which has the maximum number of red colour alleles, so R₁ type R₂ type is insufficient to guarantee the darkest shade.
Step 2
B. seeds with genotypes R₁ type R₂ type R₁ type R₂ type and R₁ type R₂ type R₂ type would have the same red colour.
Answer
This statement is true. Both genotypes have the same number of R₁ type and R₂ type alleles. The presence of R₁ type and R₂ type alleles in both genotypes implies they would produce similar red colours.
Step 3
C. parents R₁ type R₂ type R₁ type R₂ type could produce seeds with the darkest red colour.
Answer
This statement is reasonable. Parents with the genotype R₁ type R₂ type R₁ type R₂ type can pass on several R₁ type and R₂ type alleles, allowing for the potential production of seeds that have the maximum number of red colour alleles, thus producing the darkest red.
Step 4
D. seeds with the genotype R₁ type R₁ type R₂ type R₂ type would have a lighter red colour than seeds R₁ type R₂ type R₂ type.
Answer
This statement is true. The seeds with the genotype R₁ type R₁ type R₂ type R₂ type only have two R₁ type alleles, whereas seeds with R₁ type R₂ type R₂ type can have more variability in allele combinations contributing to a darker colour.