CH12: Meiosis

sexual reproduction

produces genetically unique offspring using mitosis and meiosis.

asexual reproduction

produces genetically identical offspring using only mitosis

all humans have the same genes

makes humans the same species

same genes but different alleles

makes for diversity among the same species

gametes

egg and sperm

haploid

cell with one copy of chromosomes

meiosis

cell division that halves the number of chromosomes

fertilization

fusion of 2 gametes during sexual reproduction

zygote

first cell of new offspring

meiosis..

halves chromosomes

fertilization..

restores full number of chromosomes

Meiosis I

starts with a diploid cell

meiosis II

starts with a haploid cell

genes

segments of DNA that encode for specific traits. Ex: eye color, hair color, height

during meiosis one diploid cell becomes..

four haploid cells