Chapter 13

Chapter 13 - Chapter 13 Meiosis and Sexual Life Cycles Gene...

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Chapter 13: Meiosis and Sexual Life Cycles Gene: hereditary unit Gametes: reproductive cells that transmit genes from one generation to the next During fertilization, male and female gametes unite, passing on genes of both parents Locus: where a specific gene is on a chromosome Asexual reproduction: individual is sole parent, passes copies of all genes o Can reproduce via mitosis, usually genetically identical (clone) Sexual reproduction: two parents give rise to offspring that have unique combinations of genes Karyotype: ordered display of arranged pairs of chromosomes Homologous chromosomes (pair of chromosomes with same length, centromere position, staining pattern) o X and Y are exception: sex chromosomes o The rest are called autosomes Any cell with two chromosomes sets is diploid, gamets are haploid Haploid sperm fuses with haploid egg, resulting egg is the zygote, diploid o As a human develops into a sexually mature adult, mitosis generates somatic cells o Meiosis is key to gametes Gametes formed by a modified type of cell division called meiosis o Occurs in only ovaries or testes, resulting in haploid sperm and egg Plants and some algae exhibit
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This note was uploaded on 09/28/2010 for the course BISC 220 taught by Professor Mcclure during the Spring '09 term at USC.

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Chapter 13 - Chapter 13 Meiosis and Sexual Life Cycles Gene...

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