Some organisms are capable of asexual or sexual reproduction. Under normal conditions, reproduction tends to be asexual. Why does reproduction tend to switch to a sexual mode during more stressful conditions?
A. asexual reproduction requires more energy to conduct
B. Sexual reproduction is simple and more rapid, allowing more offspring
C. Sexual reproduction reduces stress, because it derives nutrients mutually from two individuals
D. sexual reproduction produces offspring with new combinations of chromosomes, increasing diversity
Ans: D. sexual reproduction produces offspring with new combinations of chromosomes, increasing diversity
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Darwin’s primary contribution to biological theory was
a. the methods for estimating the age of fossils b. the concept that organisms change over time and form new species c. the mechanism by which mutations come about d. the concept of gene pools and changes in allele frequencies e. the mechanism by which populations of organisms change over time
A capillary tube is used to acquire a small blood sample for CBC (complete blood count) analysis. Suction is not required to transfer the blood from the fingertip prick to the tube in part due to
A. covalent bonding between the water molecules. B. adhesive forces between the water molecules and the glass particles of the tube. C. ionic bonding between the water molecules. D. cohesive forces between the glass particles of the tube and the water molecules.
Hiking up an elevational gradient, you notice different species of birds becoming more dominant the higher you go. This could be because
A) older birds prefer lower elevations. B) competitive abilities change along environmental gradients. C) of population cycling. D) there are more predators at higher elevation.
Females with a ____________ trait must have a father with the trait.`
Fill in the blank(s) with the appropriate word(s).