In a three-point mapping experiment, which class do you expect to find the least?
A) recombinant
B) double crossover
C) parental
D) single crossover
E) noncrossover
Answer: B
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When division of the zygote reaches the eight-cell stage and the planes of cleavage of the upper four cells line up with those of the bottom four cells so that two tiers of cells result, one directly above the other, the type of cleavage is called:
A. direct cleavage B. spiral cleavage C. indirect cleavage D. protostome cleavage E. radial cleavage
Type O blood is missing both anti-A and anti-B antibodies
Indicate whether this statement is true or false.
The abiotic factor that has had the greatest evolutionary effects on deep-sea animals is:
a. low temperatures. b. high pressure. c. low nutrients. d. lack of light. e. varying salinity.
The female gametophyte generation in angiosperms is found in the:a
antheridium. b. stigma and style of the pistil. c. prothallium. d. megasporophyte of the cones. e. ovule of the ovary