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Published byDaisy Watts Modified over 9 years ago
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UNIT 3: GENETICS: The study of genes, heredity, and variation.
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Onion Root Mitosis Lab
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Onion Root Mitosis Lab
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Onion Root Lab Makeup Grade:
See Biology calendar on my web site (click Friday 10/24) for a makeup assignment that will replace lab grade Make-up assignment due by Wednesday 10/29
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CHAPTER 6: MEIOSIS Process that creates sex cells (sperm/eggs)
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SECTION 6.1: CHROMOSOMES: Bundles of DNA that form during mitosis
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Human cells contain 46 chromosomes (23 pairs)
22 of these pairs are homologous pairs One came from Mom, one from Dad They are almost identical
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Chromosomes that are NOT sex chromosomes are called AUTOSOMES
Humans have 44 autosomes
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Sex Chromosomes (X and Y) determine gender
XX = GIRL XY = BOY
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Two Types of Cells in your body
1. Somatic Cells 2. Gametes Normal body cells Found everywhere in body Sex cells Found in ovaries and testes
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Two Types of Cells in your body, continued
1. Somatic Cells 2. Gametes Diploid: they have 2 copies of each chromosome (46 total) Haploid: They have only 1 of each chromosome (23 total)
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Fertilization occurs when a sperm and egg combine
Sperm (23 chromosomes/haploid) + Egg (23) = New human! (somatic cell, diploid, 46 chromosomes)
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Different species have different numbers of chromosomes (whatever works!!)
Fruit fly, 8 Human, 46 Goldfish, 100 Tongue fern, 1,200
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6.1 Study Guide due @ end of class
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Contrasting MITOSIS and MEIOSIS
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