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Sexual
Reproduction
and
Meiosis
Chromosome Number
Organisms have a set number of
chromosomes specific to that species
Each body cell has a complete set of
those chromosomes
Diploid number
Number of chromosomes in body cells
of sexually reproducing organisms
2n =___
2n = 46
2n = 48
2n = 1400
Haploid number
Number of chromosomes in sex cells,
gametes, of sexually reproducing
organisms
½ the diploid number of chromosomes
n=__
Human egg: n= 23
Human sperm n=23
2 haploid gametes produce a
diploid zygote upon fertilization
Egg n= 23
Sperm n=23
Fertilization
Zygote
2n=46
Homologous
Chromosomes
Paired chromosomes
Same size and shape
Genes for same traits
One came from egg,
one from sperm
Determine the Missing Number
Organism
Human
Garden pea
Fruit Fly
Tomato
Dog
Corn
Shrimp
Mammoth
Body Cell
(2n)
Gamete
(n)
46
7
8
12
78
10
254
29
Organism
Human
Garden pea
Fruit Fly
Tomato
Dog
Corn
Shrimp
Mammoth
Body Cell
(2n)
46
14
8
24
78
20
254
58
Gamete
(n)
23
7
4
12
39
10
127
29
How do we get from
How do we get from the
the
diploid
number
of
diploid number of
chromosomes in body
chromosomes in body
cells
to
the
haploid
cells to the haploid
number of
number of chromosomes
chromosomes
in
sex
in sex cells
cells?
15 Meiosis.pdf (PDF, 762.51 KB)
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