Bio Unit 5 Test

How can you determine the genotype of a plant showing the dominant phenotype of red color? (R= red, r=white)

Cross the red plant with a white plant to see if any white plants appear.

Roberts Syndrome is an extremely rare genetic disorder that is characterized by mild to severe prenatal retardation or disruption of cell division, leading to malformation of the bones in the skull, face, arms, and legs. Shown below is a pedigree for a family with Robert's Syndrome. Consider couple II-C and II-D. What is the probability that their next two children will have Roberts syndrome?

1/16

An organism that is heterozygous for two traits can produce a maximum of ______ different gametes for these traits.

4

Height in humans is a polygenic trait. Assume the following: There are four genes that determine height (Aa, Bb, Cc, Dd) Each dominant allele adds 2 inches of height to an individual The height of the recessive individual (aabbccdd) is 5 feet What is the height of a person with the genotype AABbccDD

5 feet 10 inches

Anury is the absence or abbreviation of the tail in animals, including sheep. It is inherited in an autosomal dominant fashion. A ram with anury is mated to a ewe with a normal tail. The ram's father had anury, his mother did not. What is the probability that the ram and ewe will produce a lamb with anury? (ram=male, ewe=female)

50%

______ occurs when 50% of a protein produces a different phenotype than that produced by 100% or 0% of the protein.

incomplete dominance

The inheritance pattern where two or more genes do not assort independently because they are close together on the same chromosome is called

linkage

The color of petunia flower can be changed from red to blue by altering the pH of the soil. This is an example of

norm of reaction

An X-Linked gene is

a gene on the X chromosome

What is a testcross?

a mating between an individual of unknown genotype and an individual homozygous recessive for the trait of interest.

Albinism in most animals is an epistatic trait characterized by a lack of melanin pigment in the eyes, skin, and hair. If the allele for albinism is a, the allele for brown coat color is B, and the allele for red coat color is b, which of the following genotypes would result in an albino cow?a

aaBB, aaBb, aabb

The agouti gene, when expressed in mice, makes them obese, ravenous, yellow, and prone to diabetes. The agouti phenotype is dominant. During ovulation an agouti mouse is given a drug that methylates (or shuts off the agouti gene). She is then bred to another mouse and gives birth to a litter of baby mice, none of whom have the agouti phenotype. Which of the following is accurate?

all of these are correct

Roberts Syndrome is an extremely rare genetic disorder that is characterized by mild to severe prenatal retardation or disruption of cell division, leading to malformation of the bones in the skull, face, arms, and legs. Shown below is a pedigree for a family with Robert's Syndrome. What is the genotype of individual IIC (R=wild type, r=Roberts syndrome)

Rr

A cross between two pea plants results in 732 purple and 268 white plants. What is (are) the genotypes and phenotypes of the parents that produced these offspring?

both parents are heterozygous purple