5.1.1 Eukaryotic organisms use sexual/asexual reproduction
Genes are made up of segments of DNA, and Genes form chromosomes
Asexual reproduction无性繁殖: the genetic information is completely identical with its descendent eg. potato
Sexual reproduction: inherits DNA from 2 parents
Compared to asexual, sexual reproduction costs more but have more genetic variation
Vocabulary:
Karyotype核型图
Sex chromosome性染色体
autosome常染色体
homologous chromatids同源染色体
diploid二倍体
hiploid单倍体
5.1.2 Meiosis produces four genetically unique daughter cells that are haploid
Meiosis1: homologous chromosomes seperate
Meiosis2: sister chromatids seperate
synapsis 联会
chiasmata 交叉点
3 mechanisms contribute to genetic variation: