gen chapter 20

The why is heritability of having two eyes very low?

Most of the variation in eye number is due to accidents and injuries

Which of the following is used to calculate Narrow-sense heritability?

Additive variance

The image below shows wild and domesticated peaches. What is this an example of?

Artificial selection

Calculate the standard deviation of the following values: 8, 12, 8 and 4.

3.26

Eye color in humans is a polygenic trait influenced by 16 genes. How many phenotypic classes of eye color would you expect?

33

How many gametes are involved in the formation of dizygotic twins?

4

Which of the following describes an expression quantitative trait loci (eQTL)?

Lactose tolerance level is determined by lactase enzyme alleles with different mutations in the promoter that influence the gene's mRNA levels

Which of the following is an example of G x E interaction?

Lobsters with allele A grow larger than lobsters with allele a in cold water environments. In warm tropical waters lobsters with allele a grow larger.

You find the heritability of height of in a population water oak trees in upstate South Carolina to be 0.67. Your colleague finds the heritability of height of in a population water oak trees in south Alabama to be 0.44. How is this possible?

Measured heritability depends on environmental variation present in population being studied

You are studying the Virginia opossum, Didelphis virginiana. You find 11 genes that influence the weight of newborn joeys, and that the mother's diet also influences birth weight. What term best describes this trait?

Multifactorial

Which of the following is NOT a major point of the multiple-gene hypothesis?

Phenotypic traits show discontinuous variation and can be cannot be quantified, only qualified

What is the difference between standard deviation and standard error?

Standard error takes sample size into account

The data below is from a twin study. Which of these traits are monozygotic twins most likely to be discordant for?

Uterine cancer

Height in a species of plant is controlled by 4 genes with additive alleles. Which of the following is a genotype you would expect for a plant of average height?

aaBBCcDd

You are studying corn and find that higher stalk height is correlated with larger cob size. Which of the following r values would be expected for this relationship?

r = +0.78