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In genetics, the term “linkage” means that

A person with Down syndrome is

When two different genes are close together on the same chromosome and tend to be transmitted together from parent to offspring, this phenomenon is called

Assuming that 50% of the offspring are male and 50% are female, what is the probability of this couple having a son with short index fingers?

In a chi square analysis involving genes that may be linked, the expected values are calculated 

A researcher conducted crosses between two different strains of Drosophila. When true-breeding flies with singed bristles (s) and normal wings (L) were crossed to true-breeding flies with normal bristles (S) and vestigial wings (l), all F1 offspring had normal wings and normal bristles. The F1 offspring were crossed to flies with singed bristles and vestigial wings. Which F2 offspring is/are nonrecombinant? 

During the technique of genomic hybridization, DNA from normal cells or cancer cells is hybridized to metaphase chromosomes. Which samples are fluorescently labeled?

The Igf2 gene that is inherited from the mother is silenced due to imprinting. A mutation, which we will call Igf2—, is a loss-of-function mutation. If an Igf2 Igf2— mother is crossed to an Igf2 Igf2  father, what is the predicted outcome?

By conducting testcrosses, researchers have found that the apple has 17 linkage groups. How many chromosomes would you expect to find in pollen cells?

A fruit fly with a diploid set of autosomes has one X chromosome but no Y chromosome. This fly would be