Transcript Meiosis

Two Types of
Reproduction
Asexual Reproduction
used by some plant and invertebrate
species
requires 1 parent
offspring are genetically identical to
the parent
uses body cells
Body Cells



called somatic cells
(somato- means “body”)
body cells are diploid = contain 2
sets (pairs) of chromosomes
(diplo- means “double”)
made by the process of mitosis
throughout the entire body
Steps of Asexual Reproduction
1. Body cells are made by mitosis
Steps of Asexual Reproduction
2. The organism undergoes binary
fission, budding or regeneration to
create an offspring
Sexual Reproduction
used by most species
requires 2 parents
offspring are genetically different
from the parents
uses sex cells
Sex Cells
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

called gametes = egg and sperm cells
(gamo- means “sex cell”)
sex cells are haploid = contain 1
set (single) of chromosomes
(haplo- means “single”)
made by the process of meiosis
inside reproductive organs
Steps of Sexual Reproduction
1. Sex cells are made by meiosis
(like “double mitosis”)
Cells divide
twice
Steps of Sexual Reproduction
2. Male & female sex cells come
together to form one body cell
(called a zygote)
Cell
from
mom
Cell
from
dad
zygote
Steps of Sexual Reproduction
3. The zygote undergoes mitosis
repeatedly until it develops into a
complete organism
Etc…
Memory Phrase
Meosis made ME-osis
Mitosis made my-TOES-es