Meiosis and producing genetically diverse offspring Discussions start(ed) this week.

This side close your eyes This side keep your eyes open Try to remember what you are about to hear.

This side close your eyes This side keep your eyes open Try to remember what you are about to hear. … It's about a kite.

A newspaper is better than a magazine, and on a seashore is a better place than a street. At first it is better to run than to walk. Also you may have to try several times. It takes some skill but it’s easy to learn. Even young children can enjoy it. Once successful, complications are minimal. Birds seldom get too close. One needs lots of room. Rain soaks in very fast. Too many people doing the same thing can also cause problems. If there are not complications, it can be very peaceful. A rock will serve as an anchor. If things break loose from it, however, you will not get a second chance.

Protein Fig 17.3

For life to exist, the information (genes) must be passed on. {Mitosis: producing more cells} {Meiosis: producing gametes} Fig 13.5

Mitosis: a DNA Perspective Fig 12.4

Sister Chromatids are replicated DNA Fig 12.4

Mitosis plays a role in: Growth and Development Repair and Turnover of Cells Reproduction –Asexual

The Cell Cycle Fig 12.5

start of mitosis Fig 12.6

For life to exist, the information (genes) must be passed on. {Mitosis: producing more cells} {Meiosis: producing gametes} Fig 13.5

vs. Asexual Reproduction Sexual Reproduction Fig 46.3

extremely low genetic diversity greater genetic diversity vs. Asexual Reproduction Sexual Reproduction How does sexual reproduction generate genetic diversity? Fig 46.3

Gene for blue eye pigment Gene for brown hair pigment Gene for growth hormone Haploid chromosomes Gene for hemoglobin Gene for DNA polymerase

Gene for hemoglobin Gene for hair color Gene for growth hormone Allele for black hair Allele for black hair Allele for low express (short) Allele for high express (tall) Allele for normal Hb Allele for sickle cell Hb Diploid chromosomes

Each pair of chromosomes is comprised of a paternal and maternal chromosome Fig 13.3

Fig 13.4 sister chromatids= replicated DNA (chromosomes) tetrad= pair of sister chromatids

Fig 13.7 Meiosis splits apart the pairs of chromosomes. X 23 in humans

haploid diploid X 23 in humans X 23 in humans X 23 in humans Inheritance = The interaction between genes inherited from Mom and Dad.

Fig 12.2 Meiosis splits apart the pairs of chromosomes. X 23 in humans

extremely low genetic diversity greater genetic diversity vs. Asexual Reproduction Sexual Reproduction How does sexual reproduction generate genetic diversity? Fig 46.3

Fig DNA cut and religated Crossing-over (aka Recombination)

Crossing-over: Proteins in the cell cut and religate the DNA, increasing the genetic diversity in gametes. Fig 13.12

Fig Independent Assortment (aka Random Assortment)

Independent Assortment 2 possibilities for each pair, for 2 pairs 2 2 = 4 combinations Fig 13.11

Independent Assortment 2 possibilities for each pair, for 23 pairs 2 23 = 8,388,608 combinations Fig 13.11

extremely low genetic diversity greater genetic diversity vs. Asexual Reproduction Sexual Reproduction How does sexual reproduction generate genetic diversity? Fig 46.3

Meiosis and producing genetically diverse offspring Discussions start(ed) this week.