If X and Y Are Two Variables with σ_x =

question 131

True/False

If X and Y are two variables with σ_x = 3.8,σ_y = 4.2,and COV(X,Y)= −0.25,then V(X + Y)= 31.58.

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Definitions:

Homozygous Dominant

An organism that carries two dominant alleles for a particular gene, expressing the dominant phenotype.

Stabilizing Selection

A type of natural selection that favors the average individuals in a population and reduces variation around the mean phenotype.

Gene Pool

All the alleles of all the genes in a population; a pool of genetic resources.

Bottleneck Effect

A sharp reduction in the size of a population due to environmental events or human activities, resulting in a decrease in genetic diversity.