Helena received a pea plant from her neighbor, and she wants to know its genotype. The neighbor told Helena that the plant produces round peas, which is a dominant trait (R) to wrinkled peas (r). Helena performs a test cross and observes that half of the offspring plants produce wrinkled peas. What is the genotype of the plant Helena received from her neighbor?
a. homozygous recessive, rr
b. heterozygous, Rr
c. heterozygous, RR
d. homozygous dominant, RR
d. homozygous dominant, RR
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Four of the five processes below are components of natural selection. Select the exception
a. genetic drift b. overproduction of offspring c. limitations in vital resources d. genetic variation e. differential reproductive success
Which of the following statements is NOT true?
a. Natural selection is based upon differential reproduction and survival. b. For evolution to occur in a population, there must be some variation. c. Most mutations have beneficial effects on traits. d. A population evolves when heritable change occurs in a line of descent. e. Over time, some genetic traits are more adaptive than others.
Which term broadly describes any kind of interaction between two or more animals?
A) competition B) dominance hierarchy C) foraging behavior D) social behavior
What is one virulence factor that differentiates Staphylococcus aureus from other species of staphylococci?
A. It has a capsule. B. It can produce coagulase. C. It produces catalase. D. it can live on the surface of the skin and in cutaneous oil glands. E. it produces lipase.