The two stages in meiosis where the most genetic recombination occurs
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The two stages of meiosis that are the most significant in terms of recombination are prophase I and
anaphase I. Of the three events of sexual reproduction that contribute to genetic variability, two occur
in meiosis itself. Prophase I is a significant stage due to crossing over events in the tetrad. This
generates genetic variability at the chromosomal level. Anaphase I increases genetic variation via the
randomness of segregation. This creates a new combination of paternal and maternal chromosomes.
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The molecule currently being investigated as a possible means of synthesis of the first proteins is:
A. mRNA. B. DNA. C. tRNA. D. rRNA. E. aminoacyl tRNA synthetases.
________ bind two or more ions or molecules and transport them in opposite directions across a membrane.
A. Uniporters B. Symporters C. Antiporters D. Dual transporters E. Channel pumps
During the light-dependent reactions, due to electron transport, the thylakoid space becomes
A. more acidic than the stroma. B. the site where the Calvin cycle occurs C. the site of NADPH production. D. the site of ATP synthesis.
The ________ is the primary germ layer that gives rise to muscle, bone, connective tissue, and organs such as the heart, kidneys, ovaries, and testes
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