Name
Date
Per
Meiosis, Chromosomes and Reproduction
1. Label the following diagram using: sperm, female somatic cell, egg, male somatic cell, zygote
2. Write the number of chromosomes that would be found in all of the cells below.
3.
What is the process that occurs in step 1?
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What is the process that occurs
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4.
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5. What is the name for haploid cells like sperm and egg cells?
6.
What term would describe the chromosomes shown below?
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Chromosome
from Mom
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Gene for height
Gene for dimples
Gene hair color
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omo!oaous cÿÿoÿe
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Gÿnÿ fnr ÿvÿ r-nlnr
Gene for height
Chromosome
Gene for dimples
from Dad
Gene hair color
Diploid cells alwa'/s have an even number of chromosomes because they exist in pairs (2n).
Haploid/sex cells contain only half the number of chromosomes (n). Egg and sperm cells are
examples of haploid cells. When the sperm fertilizes the egg, it becomes a diploid cell. (n + n -- 2n)
7. Complete the following table of chromosomes in various species.
Species
Number of
chromosomes in
Number of homologous
chromosome pairs in
Number of
chromosomes in
diploid cells (2n)
diploid cell
haploid cells (n)
Humans
2n = 46
N = 23
Fruit fly
2n=8
nsq
Leopard frog
Armadillo
n=13
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Below are pictures of somatic cells before meiosis° Draw all of the possible gametes that could be
formed.
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10. What is the purpose of meiosis?
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11. How might life on earth be different if crossing over did not occur?
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12. The actual number of chromosomes in a sperm cell is 2.'ÿ
therefore making it a
Diploid) cello
13. Why is sexual reproduction (meiosis and fertilization) important to the survival of species?
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