B1 - Chromosomes and Mitosis

How many chromosomes does a human body cell have?
23 pairs (46 single) chromosomes.
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What are chromosomes made up of?
Chromosomes are made up of coiled up stands of DNA, which form genes.
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What is the role of genes?
Genes code the body to develop specific characteristics and features such as hair colour and eye colour.
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Hiw do humans inherit the chromosomes stored in their cells?
When the gametes of the parents, each containing half the chromosomes of a normal human body cell, fuse together, a cell is formed with a full set of chromosomes, half from each parent.
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Why does mitosis occur?
Mitosis occurs so organisms can grow and replace any damaged cells.
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Describe the process of mitosis.
The DNA and subcellular structures, such as mitochondria, are replicated. Then the chromosomes line up in the centre of the cell and it begins to divide. Once the nucleus has split, a membrane forms around each one and the cell splits in half.
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How many daughter cells does mitosis produce?
Two new daughter cells are produced through mitosis. These daughter cells are genetically identical. The DNA is also identical to that of the parent cell.
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Other cards in this set

Card 2

Front

What are chromosomes made up of?

Back

Chromosomes are made up of coiled up stands of DNA, which form genes.

Card 3

Front

What is the role of genes?

Back

Preview of the front of card 3

Card 4

Front

Hiw do humans inherit the chromosomes stored in their cells?

Back

Preview of the front of card 4

Card 5

Front

Why does mitosis occur?

Back

Preview of the front of card 5
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