b-4.5 students will be able to summarize the characteristics of the phases of meiosis...
TRANSCRIPT
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B-4.5 Students will be able to summarize the characteristics of the phases of meiosis 1 and II
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Number your notebook and label the top the following:
Agenda
1. Go over test results/Questions/Redo
2. Introduction Notes
3. Meiosis Intro WS
4. Finish Vocabulary/Work on Redo
EVEN Pages-LEFT SIDE
Page 142- Concept Map
Page 144- Quizzes
Page 146- Sequence
Page 148- Vocabulary
Page 150- Warm Ups
Page 152- Introduction WS
ODD Pages-RIGHT SIDE
Page 143- Concept Map
Page 145- Quizzes
Page 147- Study Guide
Page 149- Vocabulary
Page 151- Warm Ups
Page 153- Intro. To Meiosis
Notes
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•Our bodies have two types of specialized cells:
Somatic Cells- body cells
• cells that make up all of the body tissues and organs
• utilize Mitosis-used for growth, development, and repair
• Asexual Reproduction = 2 identical daughter cells with same number of chromosomes as original cell
Two Types of Cells & Two Types of Division
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Germ Cells develop into Gametes- sex cells
• an egg or a sperm cell
• utilize Meiosis- defined as “division resulting in a reduction in chromosome number”
- AKA: Meiosis is the creation of gamete cells (sperm
and egg)
- gametes will NOT be identical= unique
- gametes have HALF chromosomes of original cell
- Sexual Reproduction= fusion of 1 egg and 1 sperm known as fertilization creates a zygote
Two Types of Cells & Two Types of Division
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• In order for offspring to be produced from sexual reproduction and have cells that are diploid, the sperm and egg cells must be haploid
• Diploid = 2 sets of chromosomes
• Haploid = 1 set of chromosomes • Somatic Cells chromosome #____ : Gamete chromosome #_____
Haploid vs. Diploid/ Somatic vs. Gamete
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All of our somatic cells are diploid – we have one set of chromosomes from EACH parent.
All of our gametes are haploid – they have half of the DNA a person should have
You must join two halves (sperm and egg) to make a whole person!
Haploid vs. Diploid/ Somatic vs. Gamete
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Chromosomes Terminology
Centromere
Centromere
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How are the gametes different? Crossing Over- (exchange of genetic material) occurs due to close proximity of homologous chromosomes- chromosomes that have the same length, appearance, and copies of genes.
(both chromosomes have the eye color gene at the SAME SPOT, but one gene may be for blue eyes while the other is for brown eyes)
-1 from Mom and 1 from Dad
The paternal chromosome comes from dad
The maternal chromosome comes from mom
Each chromosome in a tetrad has two sister chromatids attached at the centromere
-Results in variation of gametes= genetic diversity!
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• Introduction to Meiosis WS
• Or Crossing Over Activity
• Study Guide Questions 1-7; 11-14
• Vocabulary
Now What?
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• Crossing Over Activity
• Study Guide Questions 1-7; 11-14
• Vocabulary
Now What?