12. During mitosis (PMAT) is completed 1 time. During meiosis, (PMAT) is
completed times. Therefore, we put numbers after the
meiosis to indicate whether the 1" or 2nd stage of division is occurring.
13. Chromosomes that are of similar size and containing the same type of gene in
the same location are said to be
chromosomes.
14. During Prophase 1 of meiosis,
occurs which
allows homologous pairs to exchange genetic information.
15.
chromosomes contribute to the variety of different traits,
16. During Metaphase 1, chromosomes line up in the
ll of the cell.
17. Chromosomes are pulled away from one another by
fibers
during Anaphase I.
18. Two new nuclei are formed and the cytoplasm is split in Telophase I and
(number) new cells are formed.
19. Meiosis II starts with what phase?
20. Crossing over DOES NOT happen in Prophase II. True or False?
21. During
, the chromosomes line up in a single line.
22.
| are pulled away by the spindle fibers during Anaphasel.
23. How many cells are formed during meiosis?
24. What 2 factors contribute to the variety of traits amongst family members?
25. What is it called when a cell receives too few or too many chromosomes during
separation which could lead to genetic disorders?
ments

Bisphenol a (often called bpa) is a chemical found in products that people use every day, from water bottles to food containers to children's toys. unfortunately, bpa leaches out of its many products and makes its way into our bodies. what are the health effects of bpa exposure? ongoing research is finding that elevated exposure to bpa can affect a wide variety of developmental and physiological processes, but one of the first studies of bpa's health effects came about because of a simple mistake in the lab. at a laboratory at case western reserve university in 1998, geneticist patricia hunt was making a routine check of her female lab mice. as she extracted and examined developing eggs from the ovaries, she began to wonder what had gone wrong. she noticed that many of the eggs showed problems with their chromosomes, and some had irregular amounts of genetic material, which can lead to miscarriages and birth defects in mammals. she learned that a lab assistant had mistakenly washed the plastic mouse cages and water bottles with a harsh soap, releasing bpa from the plastic. knowing that bpa is an endocrine disruptor, a chemical that can enter organisms and mimic hormones, hunt set out to discover whether it had adversely affected her mice.

The diagram shows the development of the oocyte and the follicle during the menstrual cycle. identify at which stage in the cycle the hormone levels are at their highest and most active.

Communication and transportation have improved as a result of scientific advancements. select the best answer from the choices provided of mark this and return save and exit next