15 Meiosis .pdf

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Original filename: 15 Meiosis.pdf
Title: Chapter 7: A View of the Cell
Author: Hoggard

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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?


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