5. Shonda carries one dominant allele for Huntington\'s disease, while Kevin has

Question

5. Shonda carries one dominant allele for Huntington's disease, while Kevin has two recessive alleles for the disease What risk do Shonda and Kevin's children have for inheriting Huntington's disease? a) It is not possible to estimate the average risk of having a child with the disease b) There is a 1 in 4 chance their children will have the disease c) One half of their children, on average, will have the disease d) All of their children will have the disease 10. If identical twins are no more similar on a given trait than are fraternal twins, we can assume that a) the trait has a high heritability index b) the trait isn't influenced by nonshared environment c) the trait has a low heritability index d) the trait isn't influenced by shared environment 11·One of the threats to the validity of twins studies of heritability is the assumption that a) nonidentical twins have environments that are more similar than the environments of identical twins b) the environment of identical twins is similar to the environment of nonidentical twins c) parents recognize the greater similarity in identical twins d) nonidentical twins are only as genetically similar as any set of brothers and sisters 16. The key idea in the concept of range of reaction is that a) there are so many things that can potentially go wrong in prenatal development that we are fortunate when only a few of them actually do b) each individual has limitless potential and it is within the individual's capabilities to realize that potential c) genes set the boundaries of the range of reaction, but environmental influences determine which possible outcomes actually materialize d) genes provide a strong buffer against environmental variation and limit the effects that the environment can have

Explanation / Answer

5. The correct answer is Option C. One half of their children on an average are likely to have the disease.

10. The correct answer is Option B. Two identical twins being more similar on a trait than fraternal twins indicates that the trait has a high heritability index.

11. The correct answer is Option C. Parents recognising greates similarly between identical twins can affect the validity of twin studies.

16. The correct answer is Option C. The range of reaction assumes that genes set the boundaries of the range of reaction but environmental influences determine which outcomes materialise.

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