During prophase a homologous pair of chromosomes consists of _____.
Fill in the blank(s) with the appropriate word(s).
Answer: two chromosomes and four chromatids
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The type of skeleton that is usually composed of either a calcium-containing shell or chitin is a(n)
A. endoskeleton. B. exoskeleton. C. hydrostatic skeleton. D. gastrovascular cavity. E. vascular canal.
If fertilization does not occur following release of the egg by the ovary, then which one of the following degenerates approximately two weeks after ovulation?
A) primary oocyte B) oviduct C) endometrium layer D) corpus luteum E) choices A through D are correct
Why are leaves green?
A) Chlorophyll molecules mainly absorb light in the blue-violet and infrared part of the electromagnetic spectrum. Chlorophyll does not absorb much green light, which is reflected to our eyes. B) Chlorophyll molecules mainly absorb light in the blue-violet and red-orange part of the electromagnetic spectrum. Chlorophyll does not absorb much green light, which is reflected to our eyes. C) Chlorophyll molecules mainly absorb light in the ultraviolet and red-orange part of the electromagnetic spectrum. Chlorophyll does not absorb much green light, which is reflected to our eyes. D) Chlorophyll molecules mainly absorb light in the ultraviolet and infrared part of the electromagnetic spectrum. Chlorophyll does not absorb much green light, which is reflected to our eyes. E) Chlorophyll molecules mainly absorb light in the green part of the electromagnetic spectrum.
Reproductive barriers that prevent hybrid offspring from developing or breeding, even if reproductive attempts have been successful, is called _____ isolating mechanisms
What will be an ideal response?