B1H

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  • Created by: ellxe
  • Created on: 12-04-16 16:35
What does the nucleus contain?
Genetic material, in the form of chromosomes
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What do chromosomes usually come in?
Pairs.
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What are chromosomes made up of?
Genes. They control the development of different characteristics e.g. eye colour
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What are genes made up of?
DNA. It is coiled up to form the arms of chromosomes.
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What are different versions of the same gene called?
Alleles.
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What are the three sources of genetic variation?
1. Gamete formation. 2. Fertilization. 3. Mutations
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What is gamete formation?
Gametes are sperm and egg cells. They are formed in the ovaries or testes. Gametes they only have 23 chromosomes. Each gamete has some from mum and some from dad, leading to variation.
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What is fertilization?
Where gametes join together. The sperm and egg, with 23 chromosomes each, form a new cell with 46. Fertilization is random - you dont know which gametes join together.
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What are mutations?
Occasionally a gene may mutate. It can create new characteristics, increasing variation.
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What are features determined by?
Genes and Environment.
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What do you need to know about inheritance?
Genetic diagrams can show the likelihood of inheriting something. (features and disorders)
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Other cards in this set

Card 2

Front

What do chromosomes usually come in?

Back

Pairs.

Card 3

Front

What are chromosomes made up of?

Back

Preview of the front of card 3

Card 4

Front

What are genes made up of?

Back

Preview of the front of card 4

Card 5

Front

What are different versions of the same gene called?

Back

Preview of the front of card 5
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