The amount of butterfat in cows' milk is controlled by polygenes - VCE - SSCE Biology - Question 8 - 2005 - Paper 1
Question 8
The amount of butterfat in cows' milk is controlled by polygenes.
With respect to polygenic inheritance it is reasonable to argue that
A. in a population each polyge... show full transcript
Worked Solution & Example Answer:The amount of butterfat in cows' milk is controlled by polygenes - VCE - SSCE Biology - Question 8 - 2005 - Paper 1
Step 1
A. in a population each polygene has only 2 alleles.
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Answer
This statement is incorrect. Polygenic traits typically involve multiple alleles for each gene, contributing to a continuous range of phenotypes.
Step 2
B. the polygenes are found on the same chromosome.
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Answer
This is not a valid assumption. Polygenes can be located on different chromosomes and do not necessarily reside on the same chromosome.
Step 3
C. the environment has no influence on the amount of butterfat in cows' milk.
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Answer
This statement is misleading. In many cases, environmental factors can affect phenotypic expression of polygenic traits, including the amount of butterfat in milk.
Step 4
D. each polygene has a contributing effect on the amount of butterfat in cows' milk.
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Answer
This is the correct statement. In polygenic inheritance, each gene contributes to the overall phenotype, meaning that each polygene influences the amount of butterfat in cows' milk.
