The chromosomes and genes are actually replicated during
A) interphase. B) telophase. C) prophase. D) anaphase. E) metaphase.
A
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What was the genotype of the mother in the P generation?
Bicoid is a maternal effect gene that is essential for the development of head structures in Drosophila. The F1 generation from a cross of two phenotypically normal flies produces normal embryos, but in the F2 cross, 25% of the embryos lack heads and die. A. BB B. Bb C. bb D. Either BB or Bb E. Either Bb or bb
Robert Paine was the first biologist to use the term keystone species in the 1960s. He was
studying food webs in the rocky, intertidal pools in the Pacific Northwest. At one of his study
sites, the dominant organisms in the tidal pools were mussels, barnacles, whelks, and a species
of starfish known as Pisaster ochraceus. To examine the relationship between these species,
Paine set up an experiment. In one area, he removed all the starfish from the tidal pools, and
in an adjacent area, he left the tidal pools as he found them. Prior to removing the starfish, he
sampled all the organisms in each pool. After two months, he repeated this sampling. A
summary of his results is illustrated in the graph below.
A period of cooling that lasted from approximately the mid-14th to the mid-19th century is referred to as the ________
Fill in the blank(s) with correct word
What is the force-generating mechanism of the contractile ring?
a) sliding myosin filaments over one another with the aid of actin b) the sliding of tubulin subunits c) the shortening of actin filaments by disassembly d) the sliding of actin filaments over one another with the aid of myosin