In cultivated stocks, the cross of a variety of white
flower plants produced all red flowers in the F1
generation, but the F2 generation produced 87 red,
31 cream, and 39 white. Explain these results by
giving the genotypes possible for each phenotype. What will be an ideal response?
Answer: R-red, r-cream, A-pigment, a-albino
9 R__ A__ red, 3 rr A__ cream, 4 __aa white
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The classical pathway for complement activation is initiated by
A) Factors released from phagocytes. B) Factors released from damaged tissues. C) Antigen-antibody reactions. D) Polysaccharides and C3b. E) C5-C9.
Eukaryotic cells are believed to have arisen
A) from a symbiotic relationship between primitive nucleated cells and bacterial cells. B) from the fusion of multiple archaeal cells into a larger, more complex cell. C) independently from prokaryotic cells. D) by mutations that lead to changes in plasma membranes, leading to internal membrane-bound organelles. E) independently from prokaryotic cells by mutations that lead to changes in plasma membranes, leading to internal membrane-bound organelles.
How many carbon dioxide molecules are produced by the complete aerobic breakdown of one glucose molecule?
A. 2 B. 3 C. 4 D. 5 E. 6
Why is speciation via changes in ploidy more likely with self-fertilizing plants than with plants that cannot self-fertilize?
What will be an ideal response?