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Gametes are needed for human sexual reproduction.

Name the two human gametes.

male gamete: sperm cell/spermatozoon

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female gamete: egg cell/ovum

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Name and describe the type of cell division that produces gametes.

meiosis

4 cells produced from one parent cell

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two divisions

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haploid cells

cells have half the number of chromosomes

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cells are genetically different

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Which process results in the production of a zygote?

specialisation

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mitosis

fertilisation

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osmosis

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State the number of chromosomes in:

A human skin cell.

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A human zygote.

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In sexual reproduction, a sperm cell fuses with an egg cell to form a new zygote.

The zygote undergoes cell division and develops into an embryo.

What type of cell division produces an embryo from a zygote?

mitosis

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How many cells are there in the embryo after 5 cell divisions?

number of cells = initial number of cells x 2ⁿ

where n = number of cell divisions

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number of cells = 1 x 2⁵

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number of cells = 32

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The diagram shows how the mass of DNA (m) changed during cell division in one cell.

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Name the type of cell division taking place in this cell.

meiosis

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The diagram shows the nucleus of the cell at the start of this type of cell division.

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Name structure A.

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Before this type of cell division can happen, the DNA in the nucleus is duplicated.

The nucleus then divides twice to form four nuclei.

Complete the diagram below to show the appearance of the nucleus of one of the four daughter cells.

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Mitosis and meiosis are two different types of cell division.

Compare these two types of cell division.

Mitosis (max 3 marks):

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produces genetically identical cells

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produces two daughter cells

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daughter cells are diploid OR daughter cells have an identical set of chromosomes

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one division

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occurs in the formation of body cells

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for growth and repair of body tissues

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no genetic variation

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Meiosis (max 3 marks):

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produces genetically non-identical cells

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produces four daughter cells

daughter cells are haploid OR daughter cells have half the number of chromosomes

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two divisions

occurs in the formation of gametes

for sexual reproduction

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results in genetic variation

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Reproduction - exam practice

Reproduction

Question 1 of 4

Reproduction - exam practice

Reproduction

Question 1 of 4