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Meiosis: sexual reproduction. Heredity and variation The science of genetics. Parents pass on genetic information to offspring. Genes (DNA) Gametes- reproductive cells haploid Somatic cells contain entire set of genes diploid. Asexual vs sexual reproduction. - PowerPoint PPT Presentation
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Meiosis: sexual reproduction
Heredity and variationThe science of genetics
Parents pass on genetic information to offspring
• Genes (DNA)• Gametes- reproductive cells– haploid
• Somatic cells contain entire set of genes– diploid
Asexual vs sexual reproduction
• Asexual: offspring identical to (single) parent
• Sexual: offspring are combination from two parents
A diploid set of chromosomes
Properties of chromosomes
The human life cycle
…and others
Meiosis: chromosomal reduction
Meiosis vs mitosis
• Purpose• Types of cells• What type of cells and how many?• Behavior of chromosomes
Comparison of mitosis and meiosis (summary)
Sources of genetic variation: independent assortment
Crossing over
Summary
• Sexual reproduction increases genetic variation
• Asexual reproduction: offspring are identical to parents (except for mutation)
• Meiosis forms gametes: reductional division– Independent assortment– Crossing over– Mutation
• These fuse to form zygotes