Exam 23: Patterns of Gene Inheritance

Due to a recessively inherited trait, some plants fail to produce chlorophyll and therefore are white rather than green. If we locate a pea plant that is heterozygous for this trait, self-pollinate it, harvest the seeds, and then plant the seeds, what are the likely phenotypes of the resulting offspring?

Which of the following crosses will yield four phenotypes in a ratio of 9:3:3:1?

In humans, widow's peak (W) is dominant over straight hairline (w). If a heterozygous male marries a female with a straight hairline, what percent of their children can be expected to have widow's peak?

The genetic makeup of an individual is also known as their

Which allele combination represents a recessive monohybrid trait?

Which genetic disorder is associated with a defect in the elastic connective tissue protein called fibrillin?

Which of the following produces an intermediate phenotype?

Indicate the genotypic and phenotypic ratios that you could expect if an individual who is heterozygous for Huntington disease has children with a normal individual.

In humans, assume straight hairline is recessive to widow's peak. A woman with a straight hairline is married to a man with a widow's peak whose mother had a straight hairline. What are the chances of the couple having a child with a straight hairline?

Mendel's law of segregation implies that the two members of an allele pair

The inheritance of blood types in humans can be explained by

What genetic disorder is associated with the lack of an enzyme necessary for the normal metabolism of the amino acid phenylalanine?

A woman who can roll her tongue is married to a man who cannot. Two of their four children can roll their tongues and two cannot. If T = tongue rolling and t = cannot roll tongue, then what is the genotype of the parents?

In the human population, short fingers are dominant over long fingers. Indicate the genotypic and phenotypic ratios if a heterozygous short-fingered female reproduces with a long-fingered male.

Unattached earlobes (EE or Ee) are dominant over attached earlobes (ee). A couple has unattached earlobes. Both notice that one of their parents on both sides have attached earlobes (ee). Therefore, they correctly assume that they are carriers for attached earlobes (Ee). If the couple proceeds to have four children, then

A blue-eyed, left-handed woman marries a brown-eyed, right-handed man who is heterozygous for both of his traits. If blue eyes and left-handedness are recessive, how many different phenotypes are possible in their children?

For Mendel's law of segregation to occur, the alleles must be

You have two true-breeding rose bushes, one with red flowers and one with white flowers. A cross between these two roses yields a bush with pink flowers. The pink flower color is an example of

Which of the following is an autosomal dominant disorder?

Hydrangeas are flowering plants with large, showy blooms. When the plant is grown in alkaline soil, the flowers are pink. When the plant is grown in acidic soil, the flowers turn blue. This change is phenotype is an example of