Section of chromosome that has genetic information for one trait

Different forms of a gene

The two alleles that control the phenotype of a trait

Physical appearance of a trait

Offspring's phenotype is a blend of the parents'

The phenotypes of both parents are seen in the offspring

Having two of the same alleles

Having two different alleles of a gene

In horses, the gene for white hair (W) is dominant to the gene for non-white hair (w). A horse with the genotype (Ww) was crossed with a horse with the genotype (ww), as shown in the Punnett Square. What fraction of the offspring should be expected to have white hair?

A partial Punnett square is shown. Which of the following statements describes the parent genotypes that would result in this Punnett square?

In humans, B is the allele for brown eyes and b is the allele for blue eyes. Two brothers both have brown eyes, but one of them has both the B and b alleles while the other only has B alleles. Which statement is true about the brothers?

In a fish species, some individuals have mouths that open to the right and some individuals have mouths that open to the left. The direction of the mouth opening is a genetic trait controlled by a single gene. The allele for a right-opening mouth (R) is dominant to the allele for a left-opening mouth (r). If two fish heterozygous for the mouth trait are crossed, what is the expected ratio of phenotypes in the offspring?

Hawaiian happy face spriders from the island of Maui can have different markings shown. A single gene determines the markings of the spiders.

A plain spider is crossed with a pattern spider. The patterned spider is homozygous. The pattern allele is dominant to the plain allele. What percentage of the offspring from this cross are expected to be patterned?

Height is a polygenic trait in humans. Which of the following statements best explains the genetics of this trait?

A pea plant with genes that are homozygous for round seeds is crossed with a pea plant that is homozygous for wrinkled seeds.

Which statement correctly predicts the results of this genetic cross?

Which of the following statements describes the parental genotypes that would result in this Punnett square?

In fruit flies, the coloration of tan with black stripes (B) is dominant to a solid black body color (b). A biologist crosses a tan male with black stripes and a female with a solid black body color. Which stated observation can lead to the biologist to the stated conclusion about the genotype of the male fruit fly in this cross? Select the correct observation AND Conclusion

What would the expected genotype be for Generation 1, given the expected phenotype ratios of Generation 2?

The graph shows the relative genetic diversity in two related species. These two species live in different areas but have similar population sizes. Which statement correctly explains why one of the species is more likely to survive an environmental change?