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Published byFrancis Parker Modified over 9 years ago
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About two trillion cells are produced by an adult human body every day!
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Cell Division Occurs in humans and other organisms at different times in their lives. Also known as cell reproduction.
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Why do cells divide?
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Stores info and tells the cells when to make proteins, and what kind to make.
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Chromosomes Chromatids - one of two duplicated, joined, identical parts of a chromosome; found after DNA replication but before cell division. Centromere – Point at which sister chromatids are attached
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Gene Centromere Chromatid Chromosome DNA supercoil
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Sperm Cell n = 23 Egg cell n = 23 Zygote 2n = 46 Haploid cells ! Diploid cells!
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Changes in chromosome number
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Monosomy 21 Trisomy 21
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chromosomes that are not directly involved in determining the sex of an individual.
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A gamete is an organism’s reproductive cell. Two examples: EGG SPERM All cells other than gamete cells are somatic cells!
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Sex chromosomes
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Male Female
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