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Bio 110 Mastering Bio Tut.34-36
Terms in this set (42)
According to the Hardy-Weinberg theorem, the frequencies of alleles in a population will remain constant if _____ is the only process that affects the gene pool.
Whenever diploid populations are in Hardy-Weinberg equilibrium at a particular locus
the allele's frequency should not change, homozygous and heterozygous genotypes may change
In a Hardy-Weinberg population with two alleles, A and a, that are in equilibrium, the frequency of allele a is 0.1. What is the frequency of individuals with AA genotype?
You sample a population of butterflies and find that 56% are heterozygous at a particular locus. What should be the frequency of the recessive allele in this population?
Allele frequency cannot be determined from this information
-Consistently causes a population to become better adapted to its environment
-A result of differential success in reproduction
-Cannot cause a harmful allele to become more common
-Causes Allele frequencies to fluctuate randomly
-Responsible for the founder effect
-Responsible for the bottleneck effect
-A result of the movement of fertile individuals or their gametes
-Can introduce new alleles into a population's gene pool
During an extreme heat wave, plants with white flowers survive better
Natural selection, frequency of white allele increases
A person uproots the five closest plants, which all happen to have white flowers
Genetic drift, frequency of purple allele increases
A storm kills many plants at random
Genetic drift, allele frequencies change but not predictably
Plants w/purple flowers attract more insects, which pollinates more plants
Natural selection, frequency of purple allele increases
Workers from a nearby greenhouse accidentally introduce white flower seeds into this population's habitat
frequency of white allele increases
In peas, a gene controls flower color such that R = purple and r = white. In an isolated pea patch, there are 36 purple-flowering plants and 64 white-flowering plants. Assuming Hardy-Weinberg equilibrium, what is the value of q for this population?
In unicorns, three alleles at a gene determine the condition of the horn. The allele for a twisted horn, HT, and the allele for a long horn, HL, are codominant; both are completely dominant to the hornless allele, h. The frequency of hornless individuals in the population is 16%, and the frequency of the allele for twisted horns is 0.1. What is the frequency of the long horn allele?
In unicorns, three alleles at a gene determine the condition of the horn. The allele for a twisted horn, HT, and the allele for a long horn, HL, are codominant; both are completely dominant to the hornless allele, h. The frequency of hornless individuals in the population is 16%, and the frequency of the allele for twisted horns is 0.1. What frequency of individuals in the population have horns that are long and twisted?
An adaptation is _____.
a trait that gives an organism a reproductive advantage in the current environment
A group of small fish live in a lake with a uniformly light-brown sandy bottom. Most of the fish are light brown, but about 10% are mottled. This fish species is often prey for large birds that live on the shore. A construction company dumps a load of gravel in the bottom of the lake, giving it a mottled appearance. Which of these statements presents the most accurate prediction of what will happen to this fish population?
The proportion of mottled fish will increase over time
Which of the following must exist in a population before natural selection can act upon that population?
variation among individuals in reproductive success, genetic variation among individuals
Once it is established in a population, a new mutation may increase or decrease in frequency depending on the environment.
You are infected with an antibiotic-resistant strain of Klebsiella pneumoniae. Where did you most likely contract it?
Current research indicates that medians are not similar to islands when comparing the diversity of animals or plants.
Natural selection ultimately depends on favorable what?
You discover that a company illegal dumped old vats of PCBs into a nearby river. What do you expect to see?
Fish with deformities
Which of these individuals is a homozygous genotype?
All the genes in a population are that population's _____.
Genetic drift is a process based on _____.
the role of chance
A mutation occurs when _____.
there is a change in the DNA sequence of a gene
Every few years a giant axe chops off the head of every person who is over 6 feet tall. How will this affect the human population?
Alleles that promote tallness will decrease in frequency
Modern travel along with migration reduces the probability of _____ having an effect on the evolution of humans
The ease with which humans travel across the globe is likely to increase _____.
Homologous pairs of chromosomes are lined up independently of other such pairs during _____.
Crossing over, resulting in an increase in genetic variation, occurs between _____.
nonsister chromatids of homologous chromosomes
In human gamete production there is an average of _____ crossover events per chromosome pair.
Crossing over occurs during _____.
Which of the following are basic components of the Hardy-Weinberg model?
Frequencies of two alleles in a gene pool before and after many random matings
Which of the following statements is NOT a part of the Hardy-Weinberg principle?
The genotype frequencies add up to two
True or false? The Hardy-Weinberg model makes the following assumptions: no selection at the gene in question; no genetic drift; no gene flow; no mutation; random mating.
What is the frequency of the A1A2 genotype in a population composed of 20 A1A1 individuals, 80 A1A2 individuals, and 100 A2A2 individuals?
What is the frequency of the A1 allele in a population composed of 20 A1A1 individuals, 80 A1A2 individuals, and 100 A2A2 individuals?
Which of the following evolutionary forces results in adaptive changes in allele frequencies?
What genotype frequencies are expected under Hardy-Weinberg equilibrium for a population with allele frequencies of p = 0.8 and q = 0.2 for a particular gene?
0.64, 0.32, 0.04
Which of the following evolutionary forces could create new genetic information in a population?
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