If John Has Schizophrenia,how Likely Is It That His Dizygotic

question 254

Multiple Choice

If John has schizophrenia,how likely is it that his dizygotic twin brother will also have schizophrenia?

• A) John's brother will also have schizophrenia.
• B) There is a 38% probability that John's brother will have schizophrenia.
• C) There is an 18% probability that John's brother will have schizophrenia.
• D) John's brother will not have schizophrenia.

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Definitions:

Positive Assortative Mating

A mating pattern where individuals with similar phenotypes or genotypes are more likely to mate with each other than by chance.

Homozygosity

Homozygosity is a genetic condition in which an individual has two identical alleles for a particular gene or genes.

Allele Frequencies

A measure of how common a particular genetic variant (allele) is within a population's gene pool.

Genetic Stasis

A period or state in which the genetic composition of a population remains relatively unchanged over time.