Which statement correctly describes the process of crossing over?
A) Pieces of a maternal chromatid break off and swap pieces with its sister chromatid, and then the same occurs
between the paternal chromatids.
B) Two chromatids (one maternal and one paternal) break off at corresponding points on homologous chromosomes. The pieces of chromatid rejoin to the chromosome in each other's places.
C) During replication, a maternal and a paternal chromosome switch places.
D) Two alleles exchange positions on a chromosome, creating new recombination frequencies.
E) While homologous chromosomes are splitting apart and separating to either end of the new nucleus, two
chromosomes switch positions and move toward the ends, opposite from where they were originally headed.
B) Two chromatids (one maternal and one paternal) break off at corresponding points on homologous chromosomes. The pieces of chromatid rejoin to the chromosome in each other's places.
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Which of the following is true of the structure
labeled “C”? a. It is composed of tubulin subunits. b. It is composed of actin subunits. c. It is a microtubule. d. It is an intermediate filament. e. It moves chromosomes during nuclear division.
A red blood cell will swell and burst when placed in which of the following kinds of solution?
a. hypotonic b. hypertonic c. isotonic d. hydrophobic. e. hyperbaric.
The importance of fungi to ecosystems is mostly as a(n)
A) producer. B) decomposer. C) parasite. D) symbiote. E) predator.
Mate-attracting features such as the bright plumage of a male peacock result from
A) intersexual selection. B) artificial selection. C) disruptive selection. D) stabilizing selection.