Chapter 10. 1 Meiosis.

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Presentation transcript:

Chapter 10. 1 Meiosis

Chromosomes Chromosomes store DNA as genes 23 pairs chromosomes 22 pairs autosomes 1 pair of sex chromosomes Body cells are diploid 1 set from mom & 1 set from dad

Homologous Chromosomes: chromosomes paired Chromosomes (cont.) Homologous Chromosomes: chromosomes paired Ex. You have two chromosome #1

Gametes Sperm & egg are haploid (1 set of chromosomes) WHY?

Meiosis Process of form gametes Two stage division: 1st division reduces chromosome # 2nd division separates chromatids

Steps of Meiosis

Steps of Meiosis

Where Meiosis Occurs Testes form sperm Ovaries form eggs

Crossing Over Exchange of genetic pieces Leads to genetic diversity

Fertilization When gametes combine they form a zygote

Comparing Meiosis & Mitosis Both have similar stages Ex: Interphase, Prophase, Metaphase, etc.

Contrasting Meiosis & Mitosis Mitosis results in two cells each with 46 chromosomes Meiosis results in four cells each with 23 chromosomes

Mitosis vs. Meiosis http://www.pbs.org/wgbh/nova/miracle/divide.html#