reproduction, mitosis, meiosis

Asexual reproduction

no gametes involved, fast but no variation

Types of asexual reproduction

binary fission(bacteria),budding(yeast),vegetative propagation(plants

Fertilization

sperm+egg—>zygote

Sexual reproduction allow

variation for better survival in changing environments

Sperm and egg chromosome count

23(haploid)

Meiosis

type of cell division that produces gametes

Where does meiosis happen

testes and ovaries

What happens to chromosome number in meiosis

reduces by half(diploid—>haploid)

Purpose of meiosis

creates genetically different sex cells, ensures each parent gives half of the chromosomes, increases genetic variation

Steps of meiosis

one diploid cell,DNA replicates,first division:homologous chromosomes separate, second division: sister chromatids separate, ends with 4 haploid gametes(each with 23 chromosomes)

Mitosis use

growth and repair

Number of divisions in mitosis

1

Number of cells made in meiosis

4

Number of cells made in mitosis

2

Genetic identity (mitosis)

identical

Genetic identity (meiosis)

different