•Exam #1 F 2/16 in WCH 1.120WCH 1.120(bring cheat sheet)•Review Th 2/15 at 5pm in TBA

•Homework #1 due at noon

CB 6.2

For life to exist, the information (genes) must be passed on.

CB 13.5

{Mitosis:producing more cells}

{Meiosis:producing gametes}

CB 5.27

DNA replication:Each strand serves as a template for producing a complementary copy, but the replication is not always perfect.

CB 12.5Cell Division

(AKA: DNA replication)

CB 12.4

Mitosis:A DNAPerspective

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

–Asexual

CB 12.2

Normally DNA is loosely packaged

During mitosis DNA is tightly packaged as chromosomes and

individually visible

CB12.6

CB 12.4

Mitosis:A DNAPerspective

CB 12.6

startofmitosis

Sexual reproduction creates genetic diversity by combining DNA from 2 individuals, but also by creating genetically unique gametes.

CB 13.5

{Mitosis:producing more cells}

{Meiosis:producing gametes}

CB 14.4

Gene forblue eye pigment

Gene forbrown hair pigment

Gene forgrowth hormone

Haploidchromosomes

Gene forhemoglobin

Gene forDNA polymerase

CB 14.4

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

CB 13.3

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

haploid

diploid

X 23in humans X 23

in humans

X 23in humans

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

Sexual reproduction creates genetic diversity by combining DNA from 2 individuals, but also by creating genetically unique gametes.

{Producing more cells}

{Producing gametes}

CB 13.5

CB 13.7

Meiosis splits apart the pairs of chromosomes.

X 23in humans

Crossing-over

Meiosis I

Meiosis II

(Ind. Assort.)

4 Haploid cells, each unique

Meiosis:In humans,over 1 trillion possible unique gametes.(1,000,000,000,000)

CB 13.9

CB 13.9 Differences between mitosis and meiosis

Mitosis only:extremely lowgenetic diversity

Meiosisand Mitosis:greater geneticdiversity

vs.Asexual Reproduction

SexualReproduction

Sexual reproduction creates genetic diversity by combining DNA from 2 individuals, but also by creating genetically unique gametes.

{Producing more cells}

{Producing gametes}

CB 13.5

haploid

diploid

X 23in humans X 23

in humans

X 23in humans

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