chromosomal basis of heredity
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1 Chromosomes and Mitosis Chapter 1 Thompson and Thompson
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Transcript of chromosomal basis of heredity
1 Chromosomal Basis of Heredity• A gene is a unit
of heredity• Genes are
carried on DNA• DNA is
contained within chromosomes as chromatin
Sex chromosomes
• These determine the sex of an individual– Two X chromosomes make a female
– One X and one Y a male
Two types of Cell Division
• Cells divide for two reasons– To create genetically identical
copies of themselves• This is
mitosis
– To create gametes that contain half of the chromosomes of the original cell
• This is meiosis
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