Meiosis and producing genetically diverse Meiosis and producing genetically diverse offspringoffspring

Discussions start(ed) this week.Discussions start(ed) this week.

This sideclose your eyes

This side keepyour eyes open

Try to remember what you are about to hear.

This sideclose your eyes

This side keepyour 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

Fig12.4

Sister Chromatids are replicated DNA

Fig12.4

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

–Asexual

The Cell CycleFig 12.5

startofmitosis

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

SexualReproduction

Fig 46.3

extremely lowgenetic diversity

greater geneticdiversity

vs.Asexual Reproduction

SexualReproduction

How does sexual reproduction generate genetic diversity?

Fig 46.3

Gene forblue eye pigment

Gene forbrown hair pigment

Gene forgrowth hormone

Haploidchromosomes

Gene forhemoglobin

Gene forDNA polymerase

Gene forhemoglobin

Gene forhair color

Gene forgrowth hormone

Allele forblack hair

Allele forblack hair

Allele forlow express(short)

Allele forhigh express(tall)

Allele for normal Hb

Allele forsickle cell Hb

Diploidchromosomes

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 23in humans

haploid

diploid

X 23in humans X 23

in humans

X 23in humans

Inheritance = The interaction between genes inherited from Mom and Dad.

Fig 12.2

Meiosis splits apart the pairs of chromosomes.

X 23in humans

extremely lowgenetic diversity

greater geneticdiversity

vs.Asexual Reproduction

SexualReproduction

How does sexual reproduction generate genetic diversity?

Fig 46.3

Fig 13.12

DNA cut and religated

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 13.12

Fig 13.11 Independent Assortment(aka Random Assortment)

Independent Assortment

2 possibilities for each pair,

for 2 pairs22 = 4

combinations

Fig 13.11

Independent Assortment

2 possibilities for each pair, for 23 pairs

223 = 8,388,608

combinations

Fig 13.11

extremely lowgenetic diversity

greater geneticdiversity

vs.Asexual Reproduction

SexualReproduction

How does sexual reproduction generate genetic diversity?

Fig 46.3

Meiosis and producing genetically diverse Meiosis and producing genetically diverse offspringoffspring

Discussions start(ed) this week.Discussions start(ed) this week.