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Members of a barley plant species show varying levels of partial resistance to the leaf rust, *Puccinia hordei* - VCE - SSCE Biology - Question 8 - 2008 - Paper 1
Question 8
Members of a barley plant species show varying levels of partial resistance to the leaf rust, *Puccinia hordei*. The graph below shows the distribution of a populati... show full transcript
Worked Solution & Example Answer:Members of a barley plant species show varying levels of partial resistance to the leaf rust, *Puccinia hordei* - VCE - SSCE Biology - Question 8 - 2008 - Paper 1
Step 1
B. polygenic inheritance.
Answer
The variation in resistance to leaf rust in the barley plants indicates that multiple genes control this trait. This is consistent with polygenic inheritance, where several genes contribute to a single characteristic's spectrum. The graph shows a continuous range of resistance levels, reinforcing the idea that many factors are at play, typical of traits inherited polygenically.