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Chapter 5: Problem 31
Which of the following traits or diseases is(are) determined by nuclear genes? A. Snail coiling pattern B. Prader-Willi syndrome C. Leber hereditary optic neuropathy
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Extranuclear inheritance often correlates with maternal inheritance. Even so, paternal leakage may occur. What is paternal leakage? If a cross produced 200 offspring and the rate of mitochondrial paternal leakage was \(3 \%\), how many offspring would be expected to contain paternal mitochondria?
Suppose a maternal effect gene exists as a functional dominant allele and a nonfunctional recessive allele. A mother who is phenotypically abnormal produces all normal offspring. Explain the genotype of the mother.
What is a reciprocal cross? Suppose that a gene is found as a wildtype (functional) allele and a recessive mutant (nonfunctional) allele. What would be the expected outcomes of reciprocal crosses if a true-breeding normal individual was crossed to a true-breeding individual carrying the mutant allele? What would be the results if the gene is maternally inherited?
On rare occasions, a human male is born who is somewhat feminized compared with other males. Microscopic examination of the cells of one such individual revealed that he has a single Barr body in each cell. What is the chromosomal composition of this individual?
Define the term epigenetic inheritance, and describe two examples.
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