Sex Cells and Meiosis
Presentation
•
Science
•
9th Grade
•
Medium
Standards-aligned
Corinne Mercaldi
Used 5+ times
FREE Resource
8 Slides • 6 Questions
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Sex Cells and Meiosis
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Multiple Choice
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Sex Cells
-Sex cells are also referred to as gametes (GAM-eets)
-Females gametes= egg cells
-Male gametes = sperm cells
-Each sex cell has half the number of chromosomes as the body cells, they are described as HAPLOID
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Multiple Choice
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Chromosome Counts
- A single body cell from a particular organism contains a certain number of chromosomes
-Examples?
Human = 46
Dog = 78
Earthworm = 36
-The number of chromosomes in a body cell is called DIPLOID
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Multiple Choice
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Multiple Select
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Meiosis and Chromosomes
-Meiosis occurs in 2 stages
1. Chromosomes duplicate, cell divides and daughter cells have full chromosome count (like mitosis)
2. Daughter cells divide again, thus reducing the number of chromosomes by half
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Multiple Choice
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Sperm and Eggs
- After Meiosis, there will be 4 sperm cells created
-After Meiosis, there will be 4 egg cells BUT 3 will not mature. Only 1 egg can be used for reproduction!!
=Ladies!!! Your eggs are limited and precious.
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Visualizing Human Chromosomes
A visual called a KARYOTYPE is used to display chromosomes
-Organized by:
Length
Pairs
Genetic bands
Male sex chromosomes: XY
Female sex chromosomes: XX
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The Exception to the Rule...
-Sometimes errors occur during meiosis and that can lead to chromosomal disorders like Trisomy 21 (Down's Syndrome)
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Multiple Choice
What is the gender of the person who has this karyotype?
Sex Cells and Meiosis
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