Heat is required for the polymerase chain reaction. Indicate whether the statement is true or false
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What type of natural selection are the population of voles going through?
A population of voles (very small mammals) live in a shady forest. The all of the voles are a light tan color, a dark brown coloration arises by a new mutation. The darker voles are harder for predators to see in the leaf litter, thus they are less susceptible to predation. After 10 generations the majority of voles in the population are the dark brown color. In the figure above the solid red line represents the number of light colored individuals before the mutation and the black dashed line represents the number of dark brown individuals after 10 generations.
A. Directional selection.
B. Stabilizing selection.
C. Diversifying selection (disruptive selection).
D. Balancing selection.
E. Negative frequency-dependent selection.
We now know that some of the 7 alleles Mendel studied are on the same chromosome in pea plants
Despite this, the law of independent assortment still applies. How can you explain this?
a. There is recombination via the synaptonemal complex during mitosis. b. There is recombination via the synaptonemal complex during meiosis. c. The law of independent assortment applies to all alleles regardless of their arrangement on chromosomes. d. Mendel was a good enough mathematician to design experiments that would result in the predicted ratios. e. Mendel was incredibly lucky.
During metaphase I, ________
A) crossing over occurs B) homologous chromosomes line up in the middle of the cell C) the nuclear envelope breaks up D) sister chromatids separate and migrate to opposite poles
All forms of typhus are associated with arthropod vectors
Indicate whether the statement is true or false