Chapter 13

Chapter 13 - Chapter 13- Meiosis and sexual life cycles...

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Chapter 13- Meiosis and sexual life cycles - Heredity o Heredity The transmission of traits from one generation to the next o Asexual reproduction: clones Vegetative reproduction Budding o Sexual reproduction Variation o Human life cycle: 23 pairs of homologous chromosomes (46) 1 pair of sex and 23 pairs of autosomes Sex chromosomes (x,y) Autosomes= No sex chromosomes Karyotype- picture of genes Used in amnioscintises Gemetes are haploid (1N)/ all other cells are diploid (2N) Fertilization (syngamy) results in a zygote Meiosis: cell division to produce haploid gametes - Alternative life cycles o Fungi/ some algae Meiosis produces (1N) cells that divide by mitosis to produce 1N adults (gametes by mitosis) o Plants/ some algae Alternation of generation: 2N sporophyte, by meiosis, produces 1N spores; spore divides by mitosis to generate a 1N gametotphyle Gemetes then made by mitosis which then fertilize into 2N sporophyte -
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Chapter 13 - Chapter 13- Meiosis and sexual life cycles...

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