Prokaryotic cell walls are constructed out of ______________
a. peptidoglycans
b. cellulose
c. gelatin
d. starch
a
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________ reproduction, in contrast, generates genetically unique offspring. To accomplish this, an organism must produce _____, sperm and egg, through the process of _______. The cells produced this way will be _______, meaning that they contain a single set of chromosomes. Such cells are produced only in the ______.
Fill in the blank(s) with the appropriate word(s).
During metaphase I of meiosis, genetic information is exchanged between two homologous chromosomes, resulting in new combinations of alleles. This process is called ________.
A. shuffling B. spermatogenesis C. homology D. crossing-over E. oogenesis
The ABO blood type system in humans is an example of:
a) codominance but not multiple alleles. b) neither codominance nor multiple alleles. c) multiple alleles but not codominance. d) incomplete dominance. e) multiple alleles and codominance.
At the start of the breeding season, male stickleback fish undergo a number of significant changes
Their bellies become bright red and they become aggressive toward other males of the species, establishing and defending territories in which they build their nests. Although most male-male encounters consist solely of the resident lunging at an intruder, if this fails to drive off the intruder, the resident may bite. Females choose to mate with males that have large territories and well-constructed nests. What would you expect to happen as nest sites become scarcer? A) The incidence of biting and other aggressive behaviors will increase. B) Females will begin to choose mates that have no territories. C) The color of the males will fade. D) Nest construction will deteriorate. E) Males will make their territories even larger.