Biology, 03.02.2020 04:05 lexieprochaskaaa

3. what important event occurs during prophase i of meiosis that does not happen in mitosis?
a. replication of dna
b. crossing over between homologous chromosomes
c. the nuclear envelope disappears
d. formation of spindle fibers
4. what occurs during crossing over?
a. two complete chromatids switch places
b. chromosomes move the other side of the cell
c. portions of homologous chromosomes interchange
d. chromosome number is cut in half

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3. "Replication of DNA" is the important event that occurs during prophase I of meiosis that does not happen in mitosis. The correct option among all the options given in the question is option "A".

4. "Portions of homologous chromosomes interchange" is what occurs during crossing over. The correct option among all the options that are given in the question is the third option or option "C".

Answer from: Quest

cells use diffusion to get substances in and out of themselves. that diffusion will occur across the cell membrane or the outer covering of the cell. because we are talking about the surface of the cell, surface area and volume are important factors here. as a cell increases in size, its surface area and volume increase as well. we call that the surface area to volume ratio (sa: vol). but the catch is that volume increases at a greater rate than surface area. in other words, as a cell gets bigger, the sa: vol gets smaller. so a really small cell like bacteria is mostly cell membrane (surface) with very little contents (volume). a really big cell like an egg, is mostly insides with a super thin membrane. so what ends up happening is that the cell cannot efficiently diffuse all of the stuff it needs in/out to survive. therefore cell size is limited to about 100mm. so how do we make organisms bigger than 100mm? cells divide! by dividing and becoming multicellular, organisms are able to grow! check out the diagrams i attached to see the effect of sa: vol. i hope this ! good luck!

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3. what important event occurs during prophase i of meiosis that does not happen in mitosis?
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