Natural Selection

Front

What does 'allele frequency' refer to in a population's gene pool?

Back

The number of times an allele appears in a population.

Front

In a population of 600 wildflowers, how many recessive alleles are present if 20 are white, 320 are homozygous dominant, and 160 are heterozygous?

Back

120 recessive alleles.

Front

Which of the following is NOT a basis for natural selection?

Back

Random chance.

Front

What type of selection does the average weight of a baby chick at birth represent?

Back

Stabilizing selection.

Front

In a population of 600 wildflowers, how many dominant alleles are present if 20 are white, 320 are homozygous dominant, and 160 are heterozygous?

Back

400 dominant alleles.

Front

Define natural selection.

Back

The process by which organisms better adapted to their environment tend to survive and produce more offspring.

Front

What is the significance of variation in a population for natural selection?

Back

Variation provides the raw material for natural selection to act upon.

Front

Explain the concept of adaptation in the context of natural selection.

Back

Adaptation is a trait that increases an organism's fitness in its environment.

Front

What is the difference between homozygous and heterozygous genotypes?

Back

Homozygous has two identical alleles, while heterozygous has two different alleles.

Front

What is the Hardy-Weinberg principle?

Back

It describes the genetic equilibrium in a population where allele frequencies remain constant.