If the nucleotide variability of a locus equals 0%, what is the gene variability and number of alleles at that locus?a. genevariability=0%;numberofalleles=0b. genevariability=0%;numberofalleles=1c. genevariability=0%;numberofalleles=2d. genevariability>0%;numberofalleles=2

How does natural selection fashion organisms?

Consider a gene that exists in two allelic forms in a simple Mendelian dominant/recessive pair. In a large population of randomly breeding organisms, the frequency of a recessive allele is initially 0.3. There is no migration and no selection. Humans enter this ecosystem and selectively hunt individuals showing the dominant trait. When the gene frequency is reexamined at the end of the year, __________.

What are the four nitrogenous bases found in RNA?a. cytosine, guanine, thymine, uracil (C, G, T, U)b. adenine, cytosine, guanine, thymine (A, C, G, T)c. adenine, cytosine, guanine, uracil (A, C, G, U)d. alanine, cysteine, glycine, threonine (A, C, G, T)

In what sense is the Hardy–Weinberg principle a null hypothesis?

There are 25 individuals in population 1, all with genotype AA, and there are 40 individuals in population 2, all with genotype aa. Assume that these populations are located far from each other and that their environmental conditions are very similar. Based on the information given here, the observed genetic variation most likely resulted froma. genetic drift.b. gene flow.c.nonrandom mating.d. directional selection.

Single strands of nucleic acids are directional, meaning that there are two different ends. What functional groups define the two different ends of a strand?

A fruit fly population has a gene with two alleles, A1 and A2. Tests show that 70% of the gametes produced in the population contain the A1 allele. If the population is in Hardy-Weinberg equilibrium, what proportion of the flies carry both A1 and A2?a. 0.7b. 0.49c. 0.42d. 0.21

In a population of 2500, how many babies would you expect to have cystic fibrosis, a homozygous recessive condition, if the frequency of the dominant allele is 0.9 and the population is at Hardy–Weinberg equilibrium?a. 0.9×2500=2250b. 2×0.9×0.1×2500=450c. 0.9×0.1×2500=225d. 0.1x0.1x2500=25