Sexual Reproduction & Meiosis

Sexual Reproduction & Meiosis

Why It’s Important

They are the reasons why no one else is exactly like you

Sexual ReproductionSexual Reproduction

• 2 sex cells, sperm & egg, join to form a zygote, which will develop into a new organism with a unique identity

A human egg & sperm at fertilization

Sex CellsSex Cells

• Sperm- male sex cell (formed from meiosis)

• Egg- female sex cell (formed from meiosis)

VocabularyVocabulary

• Fertilization- joining of sperm & egg Forms a zygote

• Zygote- a diploid cell formed when sperm and egg join

• Diploid Cells- body cells; cells with pairs of chromosomes Skin, bone, brain cells, etc

• Haploid Cells- cells with HALF the number of chromosomes as body cells Sperm & Egg

Haploid is Half of Diploid!

You Try ItYou Try It

• Q: How many chromosomes are in a human’s body cell?

• A: That’s Right! 46• Q: How many chromosomes would be in a

human sex cell (haploid cell)?• A: YES…23• Why?- Haploid cells have HALF the # of

chromosomes as Diploid cells

How are sex cells formed?How are sex cells formed?

Meiosis- process by which the number of chromosomes is reduced by half to form sex cells

• Ensures offspring will have the same # of chromosomes as the parent

FertilizationFertilization

Fertilization Activity: Guess Who!!!!

Fertilization Activity: Guess Who!!!!

Kangaroo 16

Opposum 22

Snail 24

Corn 20

Cabbage 18

Slime: What is it????Slime: What is it????

• Objective: Determine the state of matter of slime.

• How is your slime like a solid?

• How is your slime like a liquid?

• What state of matter were the slime ingredients?

Meiosis ReviewMeiosis Review

• 1) If the haploid # of a white-tailed deer is 35. How many chromosomes would be in their sex cells?

• 2) A rabbit has a haploid number of 22. What is the number of chromosomes in the zygote of a rabbit?

• 3) The giant panda’s diplioid number is 42. What is its haploid number?

• 4) The hyena has 40 chromosomes in its body cells. How many chromosomes are in its sex cells?

Haploid v. DiploidHaploid v. Diploid

• 1. _______________: body cells, has double (or pairs) of chromosomes.

• 2. _________________: sex cells, had half the number of chromosomes in the body cells.

•

• 3. If dogs have 39 chromosomes in their sex cells, how many chromosomes are in their body cells?

• 4. If the diploid number of a koala’s body cell is 16, what would be the haploid number?

• 5. A fruit fly has 3 chromosomes in their sex cells. How many chromosomes would be present in the zygote?

• 6. The diploid number for a rabbit is 44. How many chromosomes

are in their sex cells? •  7. A spinach haploid cell contains 5

chromosomes. How many chromosomes are in spinach’s diploid cell?