HEREDITY
THE PEDIGREE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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X-linked inheritance, since only males are affected.
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Y-linked inheritance:Males inherit from their fathers.
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The extra finger trait is autosomal dominant.
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A spontaneous mutation occurred.
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Detailed explanation-1: -Extra digits are known to be common in members of the father’s extended family, but not the mother’s. The boy’s two sisters have normal fingers. What is the most likely explanation? X-linked inheritance, since only males are affected.
Detailed explanation-2: -Autosomal dominant inheritance is a way a genetic trait or condition can be passed down from parent to child. One copy of a mutated (changed) gene from one parent can cause the genetic condition. A child who has a parent with the mutated gene has a 50% chance of inheriting that mutated gene.
Detailed explanation-3: -Genes located on the chromosomes that are inherited together are called linked genes. When the genes are located on an autosome, they are said to be autosomal linked genes. Therefore, autosomal linkage refers to two or more genes being carried on the same autosome.