Genetic variation

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What is Genetic Variation?
 The variety of characteristics controlled by our genes e.g. skin, hair, eye colour, blood group, freckles etc.
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Where are our genes?
 Our genes are in our chromosomes
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How many chromosomes do we have, what are the exceptions to this answer what are they made of ?
 23 pairs in all human cells except from red blood cells and gametes. DNA
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How do we have genetic variation?
Many characteristics are due to the mutation of genes in our ancestors  Some of our variation is due to things that happened during our life-these are environmental variations e.g. Muscles, etc.  Sometimes our genes and the environment work toget
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Why are there no chromosomes in red blood cells or gametes?
Gametes have to fuse to create the one cell with 23 pairs of chromosomes that we began with and red blood cells don’t have a nucleus
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Why are there no chromosomes in red blood cells or gametes?
Gametes have to fuse to create the one cell with 23 pairs of chromosomes that we began with and red blood cells don’t have a nucleus
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Name features of some organisms that definitely have sexual reproduction?
Animals and plants do this, Needs two parents, Gametes are made, Cell fusion involved  Variety in offspring
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Name features of some organisms that definitely have asexual reproduction?
 Common in bacteria and single cellular organisms.  Plants do it  Needs only one parent  No cell fusion involved  Offspring are clones
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Other cards in this set

Card 2

Front

Where are our genes?

Back

 Our genes are in our chromosomes

Card 3

Front

How many chromosomes do we have, what are the exceptions to this answer what are they made of ?

Back

Preview of the front of card 3

Card 4

Front

How do we have genetic variation?

Back

Preview of the front of card 4

Card 5

Front

Why are there no chromosomes in red blood cells or gametes?

Back

Preview of the front of card 5
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