1. A diploid cell in the male (spermatocyte) undergoes meiosis I and II and produces how many sperm? 2. A diploid cell in the female (oocyte) undergoes meiosis I and II and produces how many eggs? Be careful. Four cells result, but they combine to form how many eggs?

3. The three polar bodies never fully mature into eggs. They are absorbed into the largest cell. This gives the egg more nutrients to use if fertilized because it is a long journey from fertilization in the Fallopian tube until implantation in the uterus. Which cell is larger, the egg or the sperm cell?

Name the part of the the brain labeled "e".

To answer this question, researchers studied populations of the dusky salamander (desmognathus ochrophaeus) living on different mountain ranges in the southern appalachian mountains. the researchers tested the reproductive isolation of pairs of salamander populations by leaving one male and one female together and later checking the females for the presence of sperm. four mating combinations were tested for each pair of populations (a and b)—two within the same population (female a with male a and female b with male b) and two between populations (female a with male b and female b with male a). the proportion of successful matings for each mating combination was measured. for example, when all the matings of a particular combination were successful, the researchers gave it a value of 1; when none of the matings were successful, they gave it a value of 0. then the researchers calculated an index of reproductive isolation that ranged from 0 (no isolation) to 2 (full isolation). the reproductive isolation value for two populations is the sum of the proportion of successful matings of each type within populations (aa + bb) minus the sum of the proportion of successful matings of each type between populations (ab + ba). the table provides data for the geographic distances and reproductive isolation values for 27 pairs of dusky salamander populations.

Identify any four organelles that should be present in the eukaryotic organism and describe the function of each organelle