A trait displays continuous phenotypic variation and is spread across a gradient. Usually, the inheritance of this trait can be described as:
1. dominant-recessive inheritance
2. multiple-allele inheritance
3. polygenic inheritance
4. sex-linked inheritance

Subtopic:  Polygenic Inheritance & Pleiotropy |
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A male with genotype AABBCC and a very dark complexion mates with a female with genotype aabbcc and a very fair complexion. What is the probability of their progeny being born with an intermediate skin colour type?
1. 6/64
2. 15/64
3. 20/64
4. 1/64
Subtopic:  Polygenic Inheritance & Pleiotropy |
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Level 3: 35%-60%

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The physiological basis of pleiotropy is:

1. lack of independent assortment in linked genes
2. separation of homologous chromosomes at anaphase I in meiosis I
3. dominance is not an autonomous feature of an allele
4. inter-relationships of many metabolic pathways in the living organisms
Subtopic:  Polygenic Inheritance & Pleiotropy |
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Level 2: 60%+

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