Each parent contributes one of the genes for a particular trait. The genes of the pair are called:

Tay Sachs disease is a fatal genetic disorder. Children born with this disorder generally die before they are five years old. A couple has had three children who died of Tay Sachs. About this couple it can safely be assumed that:

When two bell shaped squash are crossed, 25% of the offspring are round, 25% are oblong, and 50% are in between, or bell shaped. This cross illustrates:

Traits that are influenced by at least several genes and also the environment are known as:

In humans, the child’s sex is determined by:

The observable traits of an organism are known as its

The gene makeup of an organism for a particular trait is known as its

The genotypes that cannot be determined from the inspection of the offspring of a cross are the:

Chromosomes that carry genes that code for the same products, such as hemoglobin or eye pigment, are said to be:

Mendel discovered principles of inheritance because he:

The color black is dominant in guinea pigs. The phenotypes of homozygous black guinea pigs and heterozygous black guinea pigs are:

In snapdragons, Tallness (T) is dominant to dwarfness (t). In a cross between two plants that are heterozygous for this trait, the percent of offspring expected to exhibit dwarfness is

In snapdragons, Tallness (T) is dominant to dwarfness (t). In a cross between two plants that are homozygous for the recessive allele, the percent of offspring expected to exhibit tallness is

In snapdragons red flower color is due to gene (R) and white to its allele (r). The heterozygous condition results in pink (Rr) flower color. In a cross between two pink snapdragons, what percentage of the offspring can be expected to be pink?

In snapdragons red flower color is due to gene (R) and white to its allele (r). The heterozygous condition results in pink (Rr) flower color. In a cross between two pink snapdragons, what percentage of the offspring can be expected to be red?

In pea plants, the allele for green pods (G) is dominant and the allele for yellow pods (g) is recessive. A researcher crosses two green pea plants, and the in F₁ generation, 25% of the offspring exhibit yellow pods. What are the genotypes of the parents?

In pea plants, the allele for green pods (G) is dominant and the allele for yellow pods (g) is recessive. A researcher crosses two green pea plants, and the in F₁ generation, all of the offspring exhibit green pods. Can you determine the genotypes of both parents

Cystic Fibrosis (CF) is a genetic disorder that is controlled by a recessive allele. If a person suffering from CF were to marry an individual who is heterozygous for the trait, what % of their children could be expected to suffer from the disease? Ignore issues of sterility in persons with CF.

Cystic Fibrosis (CF) is a genetic disorder that is controlled by a recessive allele. If a person suffering from CF were to marry an individual who is heterozygous for the trait, what % of their children could be expected to unaffected carriers of the trait? Ignore issues of sterility in persons with CF.

In dragons, large scales (S) are dominant and small scales (s) are recessive. A dragon that is heterozygous for the trait is crossed with a dragon that has small scales. What should be the ratio of large-scaled dragons to small-scaled dragons among the offspring?