What is "nitrogen fixation" and how do legumes play a role in this important cycle?
What will be an ideal response?
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Summer squash plants with the dominant allele C bear white fruit, whereas plants homozygous for the recessive allele c bear colored fruit. Summer squash have a second locus that acts as a modifier gene if the plant is colored. IF the plant is colored and is G-- at the second locus, they will be yellow. If they are colored and gg at the second locus, they will be green. What will the ratio of white to yellow to green squash be in a cross between a double heterozygous plant and a double homozygous recessive plant (CcGg x ccgg)?
a. 4:3:1 b. 2:1:1 c. 9:3:3:1 d. 1:4:6:4:1
Along with having a variable number of toes, some kittens from Jake and Lucy's litter had a white spot on their nose. In fact, out of the 16 kittens, all 10 males had the white spot, but none of the 6 females had the white spot. Jake has a white spot on
his nose, but Lucy does not. What can you conclude from this information? A) A sex-linked gene that controls the expression of the white spot is found on the Y chromosome. B) A sex-linked gene that controls the expression of the white spot is found on the X chromosome. C) The genes for the white spot and for polydactyly are linked. D) The genes for the white spot and for polydactyly are not linked.
Bacterial endospores are among the most resistant forms of life known to science
a. true b. false
Spiegelman and colleagues demonstrated natural selection in RNA replications because in their experiments:
a. RNA molecules had differential survival and replication rates. b. RNA was self-replicating. c. the researchers chose which RNA molecules to replicate. d. RNA was copied into DNA.