Unit 2 Genetics and
Adaptation
Meiosis: haploid gamete
formation
Meiosis: haploid gamete formation
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By the end of this lesson you should be able to
do the following:
State that meiosis is a type of cell division
that produces gametes.
Explain the meaning of the terms diploid and
haploid in relation to gamete mother cells and
gametes.
State the location of gamete mother cells in
mammals and flowering plants.
Describe the two consecutive divisions of
meiosis with the use of diagrams.
Meiosis
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Meiosis is a type of cell division which
produces gametes.
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Meiosis occurs only in gamete mother
cells and it results in variation.
Gamete mother cells
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Gamete mother cells are diploid. This
means they contain two sets of
chromosomes (2n).
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Gamete mother cells undergo meiosis
to produce gametes.
Gametes
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Gametes (sex cells) are haploid which
means they contain one set of
chromosomes (n).
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Gametes fuse together during
fertilisation to form a zygote.
Task
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Copy and complete the following table using
p82 of the Higher Biology text book.
Location of
gamete mother
cells
Mammals
Flowering plants
Gametes
Task
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Without using your notes, work in
pairs to complete the “haploid / diploid
cell” diagram from your pack.
Process of meiosis
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Meiosis consists of two consecutive
divisions.
The first reduces the chromosome
number by half.
 The second produces four genetically
different gametes.
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First meiotic division
Task
Complete the “meiosis- 1st division”
diagram from your pack.
 Use p 80 of the Higher Biology text
book to help.
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Second meiotic division
Task
Complete the “Meiosis- 2nd division”
diagram from your pack.
 Use p81 from the Higher Biology text
book to help.
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Can you do the following?
State that meiosis is a type of cell division
that produces gametes.
 Explain the meaning of the terms diploid
and haploid in relation to gamete mother
cells and gametes.
 State the location of gamete mother cells in
mammals and flowering plants.
 Describe the two consecutive divisions of
meiosis with the use of diagrams.
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