Genetic variability in sexually reproducing organisms arises within
A) crossover events between nonsister chromatids.
B) crossover events between sister chromatids.
C) egg and sperm genetic recombination from distinct individuals.
D) egg and sperm genetic recombination from an individual.
E) both choices B and C
B) crossover events between sister chromatids.
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Microscopic fossils are also called microfossils
A. These minerals are needed as cofactors for enzymes needed in photosynthesis. B. These minerals are needed as cofactors for enzymes needed in cellular respiration. C. These skeletons allow for more complex reactions to take place inside the cell. D. These skeletons probably afforded them protection from being eaten. E. These minerals are necessary to maintain genome integrity.
The graphs below show the frequency of the b+ allele over twenty generations in two populations of heterozygous
flour beetles (data for a population of ten individuals is shown in graph A; data for a population of one hundred individuals is shown in graph B). Why does the frequency of the b+ allele increase in both populations?
a. b+ is a lethal allele b. b+ is a balanced polymorphism c. b+ is a fixed allele d. the b+ allele is adaptive e. b+ is a neutral mutation
Gastrulation is controlled by signal-sending cells that cause movement of neighboring cells and this is
called __________. Fill in the blank(s) with the appropriate word(s).
The ________ of several nephrons empties into a single collecting duct that eventually drains into the renal pelvis
Fill in the blank(s) with correct word