What is the process that eventually leads to the death of a plant?
A. Senescence
B. Outcrossing
C. Abscission
D. Perennial
E. Dichogamy
Answer: A
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Tall corn plants (T) are dominant to dwarf plants (tt). Solid green leaves (G) are dominant to leaves with a white tip (gg). A cross between two corn plants yielded the following phenotypes: 51 tall plants with a white tip on their leaves; 43 dwarf plants with solid leaves; 48 dwarf plants with white tips on their leaves; 45 tall plants with solid leaves. What are the genotypes of the parents
that produced these plants? a. TtGg x TtGg b. TtGg x Ttgg c. ttGG x TTgg d. TtGg x ttgg e. None of the above
Chromatids are
a. attached at the centriole. b. a pair of chromosomes, one from the mother and one from the father. c. attached at their centromeres. d. identical until crossing over occurs. e. attached at their centromeres and are identical until crossing over occurs.
Which of the statements below is true about
warfarin? a. It is a very effective rodenticide. b. It interferes with blood clotting in rats. c. Rats that are resistant to warfarin possess a gene that is rare among vulnerable rats. d. It is an agent of natural selection in rats. e. All of these are true.
One hypothesis about the decline in cell numbers during death phase is that the cells aren't all dying but instead remain alive but unable to grow when cultured, at least temporarily. These are known as ________.
A. ghost cells B. programmed death cells C. death phase cells D. viable but nonculturable cells