4 Written questions
2 Matching questions
- which of the following is a correct statement about mutations?
A. they are a source of variation for evolution
B. they drive evolution by creating mutation pressures
C. theyre irreversible
D. they occur in germ cells but not in somatic cells
E. they are most often beneficial to the organissm in which they occur
- A LARGE POPULATION OF LAB AANIMALS HAS BEEN ALLOWED TO BREED RANDOMLY FOR A NUMBER OF GENERATIONS. AFTER SEVERAL GENERATIONS, 49% OF THE ANIMALS DISPLAY A RECESSIVE TRAIT aa THE SAME PERCENTAGE AS AT THE BEGGINING OF THE BREEDING PROGRAM. THE REST OF THE ANIMALS SHOW THE DOMINANT PHENOTYPE, WITH HETEROZYGOTES INDISTINGUISHABLE FROM THE HOMOZYGOUS DOMINANTS.
what proportion of the population is probably heterozygous Aa for this trait?
- a A
- b B
5 Multiple choice questions
5 True/False questions
A LARGE POPULATION OF LAB AANIMALS HAS BEEN ALLOWED TO BREED RANDOMLY FOR A NUMBER OF GENERATIONS. AFTER SEVERAL GENERATIONS, 49% OF THE ANIMALS DISPLAY A RECESSIVE TRAIT aa THE SAME PERCENTAGE AS AT THE BEGGINING OF THE BREEDING PROGRAM. THE REST OF THE ANIMALS SHOW THE DOMINANT PHENOTYPE, WITH HETEROZYGOTES INDISTINGUISHABLE FROM THE HOMOZYGOUS DOMINANTS.
what is the estimated frequency of allele a in the gene pool?
E. 0.07 → C
which of the following is probably the best explanation for the fact that Antarctic penguins cant fly, although there is evidence that millions of years ago their ancestors could do so?
A. penguins live on land and feed in the water, therefore they have no need to fly
B. the antarctic home of penguins is flat and barren, so there's no place to fly
C. ancestral penguins without large wings were better able to swim and feed in water, so they passed their genes for shorter wing structure to their offspring
D. ancestral penguins didnt use their wings for long periods of time, so todays penguins have tiny nonfunctional wings → E
in a small group of people in kentucky, there is a high incidence of "blue skin", a condition that results from a variation in structure of the hemoglobin. all of the blue skinned residents can trace their ancestry to one couple, who were among the original settlers of this region. the unusually high frequency of blue skin is an example of
B. genetic drift
C. natural selection
D. sexual selection
E. heterozygote advantage → D
which of the following best supports the statement that mitochondria are descendants of endosymbiotic bacteria-like cells?
A. mitochondria and bacteria possess similar ribosomes and DNA
B. mitochondria and bacteria possess similar nuclei
C. glycolysis occurs in both mitochondria and bacteria
D. both mitochondria and bacteria have microtubules
E. neither mitochondria nor bacteria possess chloroplasts → A
greatest diversity of species
A. tropical rain forest
C. arctic tundra
D. temperate grassland
E. desert → B