Ch 11

11.4 Meiosis

Objectives:

1. How many sets of genes are found in most adult organisms?
2. What events occur during each phase of meiosis?
3. How is meiosis different from mitosis?
4. How can two alleles from different genes be inherited together?

Vocabulary:

• Meiosis
• Diploid
• Haploid
• Gamete
• Fertilization
• Zygote
• Homologous chromosome
• Tetrad
• Crossing over
• Chiasma

Crossing over:

At what stage in meiosis does crossing over occur?

Of what advantage is crossing over in gamete formation?

Examine the chromosomes below.

If crossing over occurred at two points, 6 and 7, what would the new genes sequence be for the 4 new chromatids?

List which genes have been exchanged.

Meiosis Review Video Links:

Meiosis: Crossing Over and Variability [3D Animation] 6:45

mhttps://www.youtube.com/watch?v=rqPMp0U0HOA

South African Runner

an “m” was added before link.  Remove before playing

mhttps://www.youtube.com/watch?v=_A9uXlaGWGg

mhttps://www.youtube.com/watch?v=wYw8LBslKT4

http://www.hhmi.org/biointeractive/meiosis