Meiosis & Sexual Reproduction

[Pages:50]Meiosis & Sexual Reproduction

AP Biology

2011-2012

Cell division/Asexual reproduction Mitosis

produce cells with same information

daughter cells: how many?________

identical? different?

What are clones? ____________

clones

same amount of DNA

__________________________ __________________________

AP Biology

Aaaargh! Im seeing

double!

Cell division/Asexual reproduction Mitosis

produce cells with same information

identical daughter cells

exact copies

clones

same amount of DNA

same number of chromosomes same genetic information

AP Biology

Aaaargh! Im seeing

double!

Asexual reproduction Single-celled eukaryotes

yeast (fungi)

Protists

Paramecium Amoeba

Simple multicellular

eukaryotes

Hydra

budding

AP Biology

What are the disadvantages of asexual reproduction?

What are the advantages?

budding

How about the rest of us? What if a complex multicellular organism

(like us) wants to reproduce?

joining of egg + sperm

Do we make egg & sperm by mitosis? No!

What if we did, then....

46 + 46

egg

AP Biology

sperm

92

zygote

Doesn't work!

Human female karyotype

46 chromosomes 23 pairs

AP Biology

Human male karyotype

46 chromosomes 23 pairs

AP Biology

Klinefelter's Syndrome



Klinefelter's Syndrome: develop as males

whataregd/klinefelter/

subtle characteristics that become apparent during puberty.

often tall

more breast tissue than normal, have a less muscular body

usually no secondary sex characteristics (facial hair or underarm and pubic hair)

Extra X chromosome primarily affects the testes, which produce sperm and the male

hormone testosterone.

AP Biology

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