Exam 11: Patterns of Inheritance

Which of the following conditions may cause infertility in a human?

Yellow pea color is dominant over green pea color, despite the observation that most store- bought, edible peas are green.

A(n) is a portion of DNA that resides at a particular locus or site on a chromosome and encodes a particular function.

If you cross pea plants that are both heterozygous for purple flowers and yellow seeds (PpYy), and you examine 800 offspring for flower and seed color, about how many do you expect to have white flowers and green seeds?

Which disorder is characterized by the individual having a normal number of sex chromosomes?

Blood typing is often used as evidence in paternity cases in court. In one case, the mother had blood type B and the child had blood type O. Which of the following blood types could the father NOT have?

If two parents are carriers of albinism (an autosomal recessive trait), what is the chance that their fourth child will have a homozygous dominant genotype?

What is the ratio of phenotypes in the offspring produced by the cross Aa × Aa? Assume complete dominance for the trait.

In people, a dimpled chin is an autosomal dominant trait. Many famous celebrities, such as John Travolta and M and Kirk Douglas, have this condition. Assume that the wrestler and actor Hulk Hogan is homozygous for the di chin, and he married a woman with a round chin. They had two children, Brooke and Nick. What is the probability that their children will show the trait?

Human females who receive sex- linked genes always express them.

In a test cross, what percentage of the offspring will have the same phenotype as the tested parent if the parent to be tested is homozygous?

In crossing a homozygous recessive with a heterozygote, what is the chance of getting a homozygous recessive phenotype in the F1 generation?

If the allele for inflated pea pods (I) is dominant to the allele for constricted pods (i), then the cross Ii xii is expected to produce

A female who is heterozygous for a recessive, sex- linked trait is a(n)

A disorder caused by nondisjunction of chromosome 21, resulting in a trisomy 21 child, is

If we cross two pea plants, each heterozygous for yellow seed color genes, the expected ratio of yellow:green among the offspring will be

Which of the following is TRUE of genes that are physically located close to each other on the same chromosome?

For which disorder can those affected be male or female?

Which of the following statements about genotypes and phenotypes is TRUE?

A woman with blood type AB and a man with blood type O have three children, one of whom is adopted. The blood types of the children are A, B, and O. What is the blood type of the adopted child?