Admit Slip

Why do girls get their period?

12/7/15

Date: 12/7/15 Topic: Reproductive Vocab Page # ___

Today in Room 326/311…

HW: Brainstorm reasons why it may be beneficial to reproduce sexually instead of asexually- use your brain!! (I will know if you Google this!!)

CONTENT OBJ: SW differentiate between sexual and asexual repro and mitosis/meiosisLANG. OBJ: SW apply reproductive vocab in contextANNOUNCEMENTS: Quiz on Wed!! (May look very similar to today!!)

AGENDA:AS: Why do girls get their period? (5 min)Menstruation/Ovulation (5 min)Reproductive Vocab notes (30 min)Repro Practice Quiz (25 min)Review Quiz (15 min)

Date: 12/7/15 Topic: Reproductive Vocab Page # ___

Menstruation

Endometrium = lining of uterus; provides nutrients to embryo; shed during menstruation

Ovulation/Menstruation

Ovulation:

https://www.youtube.com/watch?v=wcVC3TFI7fQ

Menstruation:

https://www.youtube.com/watch?v=8viFSWE_t9Q&index=71&list=PLF_-tIFq2lApRqbnyX8oSltmRzwTJQa-0

(Watch from 0:20 to 1:00)

Which reproductive organs make hormones?*

Female?

Ovaries

Estrogen (ovulation)

Progesterone (pregnancy)

Male?

Testes

Testosterone (sperm formation)

*Sex organs (ovaries/testes) = gonads

How are twins formed?Video:https://www.youtube.com/watch?v=RbxADfjigsU

Sex Cells*

Female?

Egg/ovum (ova)

Male?

Sperm

Scientific name for sperm/egg?

Gametes

Chromosomes*Organized packaging holding DNA

Found in the nucleus of cells

Humans have 23 pairs, total of 46 chromosomes

23 chromosomes from mom, 23 from dad combine to make23 PAIRS (46 total)

Sex Determination*

22 pairs of chromosomes called autosomes (any non-sex chromosome)

23rd pair (one pair) are sex chromosomes

Egg from female = X

Sperm from male = X OR Y

Females = XX

Males = XY

Ploidy*Ploidy = references # of chromosomes

One set of chromosomes = n = haploid/monoploid

Two sets of chromosomes = 2n = diploid

Sperm = n (haploid)

Egg = n (haploid)

sperm + egg = zygote = 2n (diploid)

Gametogenesis*

Process of producing gametes

Spermatogenesis = process of producing sperm

Oogenesis = process of producing ova

Gametes (sperm/egg) produced in the gonads (testicles/ovaries) by meiosis (type of cell division)

Meiosis produces genetically different cellsMitosis produces genetically identical cells

“Genesis” means “formation of”

Mitosis = results in diploid cells* Meiosis = results in haploid cells* Chromosome # does NOT change* Chromosome # reduced by half*

Cell replication*Meiosis responsible for sex cell replication (sexual reproduction)

Mitosis responsible for body cell replication(also responsible for asexual reproduction in other organisms)

Human body goes from a few cells a trillion cells

Differentiation = cell changesfrom one cell type to another

Word Associations*Bacteria

Asexual reproduction

Identical offspring

Mitosis

Haploid

Humans

Sexual reproduction

Unique offspring

Mitosis (body cells) & Meiosis (sex cells)

Diploid (except for sperm/egg)

For each organism, determine…

- Use sexual or asexual reproduction?

- Result in identical or unique offspring?

- Cell division through mitosis or

meiosis?

- Produce diploid or haploid cells?^^ Discuss in pairs

Fertilization & Development*

Humans: internal fertilization & internal development

(sexual intercourse) & (fetus grows in uterus of mother)

Fish: external fertilization & external development

(eggs on ground, male drops sperm on eggs) & (zygote grows inside egg, outside mother)

Which strategy is MORE LIKELY to lead to an offspring that successfully develops into an embryo and eventually a baby? Internal development and fertilization is the

best way to ensure offspring survival

Asexual vs. Sexual Repro Review

Sexual repro is when …

Sperm & egg combine (doesn’t matter how!)

Gametogenesis

Asexual repro methods…

Budding

Binary fission

Sporulation

Regeneration

Cleavage furrow

spores

hydra

Repro Practice Test

In pairs, read out questions to each other and decide on the answers

Debate as necessary, and circle answer

We will discuss answers at the end

You get credit when you complete the packet