Meiosis Unit 4-3 Notes Mr. Hefti - Biology. 1. Definition Cell division that occurs only in gonads producing gametes. –Spermatogenesis - in testes.

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Presentation transcript:

Meiosis Unit 4-3 Notes Mr. Hefti - Biology

1. Definition Cell division that occurs only in gonads producing gametes. –Spermatogenesis - in testes / results in sperm cells –Oogenesis - in ovaries / results in egg cells Involves the same stages as mitosis!

2. How many cells result? Complete process requires two cycles (meiosis I and II) 4 new cells are produced –4 viable sperm –1 / 4 egg cells viable

3. What is the mathematical equation for meiosis? 2N ￫ 1N + 1N + 1N + 1N “A diploid cell divides and makes 4 new haploid cells”

4. How do the daughter cells compare to the parent cell? Can be totally different! –New combinations of chromosomes are possible due to crossing over –Parent cells (in gonads) are diploid while gametes are haploid This is part of the reason sexual reproduction results in so much variation amongst offspring!!!