Download A Chromosome Study

A CHROMOSOME
STUDY
Karyotype
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Prepare a karyotype of the chromosomes provided.
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Karyotype: a pattern or picture of chromosomes from one
cell grouped into pairs and organized by size
Pair up each chromosome with its homologous partner,
using the size and markings to determine pairs.
On a blank paper, arrange the chromosome pairs from
largest to smallest and number them (from 1-22).
Put the sex chromosomes last (this is pair 23).
Glue or tape the chromosomes to the paper in the
correct order.
Analysis
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How many total chromosomes are present in this
karyotype?
How many chromosomes are present in each cell of
this human?
Analysis
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Does your karyotype represent a male or a
female?
Female: two X chromosomes
Male: an X chromosome and a
Y chromosome
Analysis
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Chromosomes that are NOT sex chromosomes are
called autosomes.
How many total autosomes are present in your
normal karyotype?
Diploid number
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Body cells are somatic cells: including skin, liver,
muscle cells, etc.
Diploid number=number of chromosomes in a
somatic cell
Varies from species to species
2n
What is the diploid number for your karyotype?
Haploid number
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Refers to the number of chromosomes in an
organism’s sex cells (sperm and egg cells)
Half the diploid number
1n
What would the haploid chromosome number for
your karyotype be?
Species
Chromosome #
in somatic cells
(2n)
Chromosome #
in gametes (n)
Human
46
23
Fruit Fly
8
Chicken
39
Goat
30
Is this rat male or female?
How many chromosomes would
be found in skin cells?
How many chromosomes are
found in the sperm cells from this
organism?