Classifying a flower as imperfect depends on what?
A. flower shape
B. missing petals
C. how often the flower blooms
D. missing sexual parts
E. where the flower grows
Answer: D
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Which event occurs in lung blood?
a. Plasma HCO3- enters erythrocytes. b. In erythrocytes, carbonic anhydrase converts CO2 and H2O into HCO3- and H+. c. Free H+ binds to hemoglobin. d. CO2 binds to hemoglobin.
Diabetes mellitus type 2 (DM2 ) is partly hereditary and, if uncontrolled, can lead to kidney disease and heart failure and an increased risk of stroke and blindness. From this information alone, you could say that DM2 is an example of ________
A) codominance B) polygenes C) pleiotropy D) epistasis
Which of the following statements about the cell cycle is correct?
A. During G2 phase, the cell grows and copies its chromosomes in preparation for cell division. B. The cell cycle is a sequence of replications and divisions that produces a new cells. C. In actively dividing cells, the S and G2 phases are collectively known as interphase. D. When the S phase of the cell cycle is finished, a cell has twice as many chromatids as the number of chromosomes in the G1 phase. E. The phases of the cell cycle are G1, S, and M phases.
Genetic analysis of a large population of mink inhabiting an island in Michigan revealed an unusual number of loci where one allele was fixed. Which of the following is the most probable explanation for this genetic homogeneity?
a. A very small number of mink may have colonized this island, and this founder effect and subsequent genetic drift could have fixed many alleles. b. The population exhibited nonrandom mating, producing a high proportion of homozygous genotypes. c. The gene pool of this population experienced high gene flow. d. Natural selection has not had enough time to produce substantial genetic variation. e. The colonizing population may have had much more genetic diversity, but very recent genetic drift may have fixed these alleles by chance.