An individual with the genotype Aa is homozygous for the trait.

Genes that are carried on the sex chromosomes are called autosomal.

In an XY male, the recessive gene on sex chromosomes is always expressed.

A female was born with attached earlobes, which is a recessive trait. Both of her parents had to have contained a recessive allele to be passed on to her.

What evidence in a pea plant supports Mendel’s law of independent assortment?

For a certain plant, purple flowers (allele: P) are dominant, and white flowers (allele: p) are recessive. A heterozygous purple plant carrying is crossed with a true-breeding white plant (homozygous recessive). What are the possible genotypes (allele pairs) of the offspring?

When offspring are produced through sexual reproduction, an offspring's traits often can be predicted by observing the traits of

Which of the following statements is true of homozygous alleles?

The American Curl is a breed of cat that has curly ears. The allele for curly ears is dominant (C). Suppose a male cat with the heterozygous genotype is bred to a female catwith the homozygous recessive genotype. Predict the number of kittens that will have the phenotype for curly ears.

If yellow color (Y) is dominant to green color (y) and round shape (R) is dominant to wrinkled shape (r), what would the phenotype of the circled offspring be?

If yellow color (Y) is dominant to green color (y) and round shape (R) is dominant to wrinkled shape (r), how many potential offspring would be green in color?

One parent is homozygous for a recessive allele and one parent is heterozygous for a recessive allele in an autosomal dominant genetic disorder. What is the chance that a child of those two parents will have the disorder?

For the trait being followed in the pedigree, individuals II-1 and II-4 in Figure 11-1 can be classified as ____.

Which of Mendel's two laws of inheritance state that organisms inherit two copies of each gene and donate one copy to each of their offspring? These genes separated during meiosis.

Which of the following phrases describes the Punnett square in Figure 6.1?

Imagine two heterozygous parents. Each as a dominant allele, X, for brown eyes and a recessive allele, x, for blue eyes. The phenotypic ratio for brown : blue eyes in their children is

Recessive alleles may not be expressed because they are

What phenotype is depicted in the figure?

According to the pedigree below mostly males are affected by this disorder. What can you infer from this information?

Hitchhiker's thumb (H) is dominant to no hitchhiker's thumb (h). A woman who does not have hitchhiker's thumb marries a man who is heterozygous for hitchhiker's thumb. What is the probable genotypic ratio of their children?

Hemophilia is a sex-linked, recessive trait. Which of the following describes the probability of hemophilia in the offspring of a man who does not have hemophilia and a woman who is a heterozygous carrier?

This diagram shows a pedigree for a recessive genetic disorder.

What is the genotype of individual 6?

Mendel hypothesized that reproductive cells have only one factor for each inherited trait. This hypothesis is supported by which observation?