Asexual vs. sexual reproduction

Fig. 8-1a

Prokaryotic asexual reproduction BINARY FISSION

Prokaryotic chromosomes Fig. 8-3b Prokaryotic chromosomes

Your chromosomes are organized into homologous pairs Fig. 8-12 Your chromosomes are organized into homologous pairs One from mom One from dad Have genes for the same traits May be different forms of the gene however Homologous pair of chromosomes Centromere One duplicated chromosome Sister chromatids

Adults produce gametes (sex cells) by meiosis Life cycle of humans Adults produce gametes (sex cells) by meiosis -these are haploid cells Haploid gametes (n = 23) n Egg cell n Sperm cell Meiosis Fertilization Haploid gametes fuse during fertilization -forming a zygote that is diploid Diploid zygote (2n = 46) 2n Multicellular diploid adults (2n = 46) Zygote divides by mitosis, cells differentiate during development  creating the adult Mitosis and development

In Meiosis I, duplicated homologous chromosomes pair up and then are separated into separate cells Diploid Haploid In Meiosis II, duplicated chromosomes are split, each chromatid going into a separate cell Haploid