The nurse notices that two brothers are phenotypically very different. What is the likely explanation?
1. The paternity of one of the brothers should be suspect since brothers are phenotypically similar.
2. The brothers were probably not raised together in the same household.
3. Environmental and genetic factors worked together to create phenotypically different individuals.
4. Their genotypes would be very similar, but environmental factors have caused phenotypic differences.
3
Rationale 1: Many times the offspring of a couple are very phenotypically different.
Rationale 2: There is little to indicate that these brothers were not raised in the same household.
Rationale 3: The genetic material passed to each brother and the effects of their individual environments and lifestyles work to create separate phenotypes.
Rationale 4: These brothers' genotypes may be dissimilar, depending on which traits were passed on through individual sperm and eggs.
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