Sexual Reproduction & Meiosis Why It’s Important They are the reasons why no one else is exactly...
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Transcript of Sexual Reproduction & Meiosis Why It’s Important They are the reasons why no one else is exactly...
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?