B1g-h

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  • Created by: notae003
  • Created on: 17-05-15 00:05
Give 2 examples of plant hormones.
Auxins and gibberellins.
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What do plant hormones do?
They control the growth of shoots, roots, flowers and the ripening of fruits.
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What is a tropism?
A directional growth response in plants.
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What is a positive tropism?
A plant growth towards a stimulus.
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What is phototropism?
A growth response to light.
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What is geotropism?
A growth response to gravity.
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Where is the genetic information for a human found?
In the nucleus.
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How many pairs of chromosomes do we have?
23 pairs.
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What are chromosomes made of?
DNA.
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What is a gene?
A section of DNA which provides the instructions for one characteristic.
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What is a mutation?
A change in a gene or chromosome.
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Give two examples of diseases that are caused by genetic mutations.
Cystic fibrosis and sickle-cell anaemia.
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What is an allele?
Different versions of a gene.
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What does homozygous mean?
If we have two of the same allele (i.e. two dominant or two recessive).
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What does heterozygous mean?
If we have two different alleles (i.e. one dominant and one recessive).
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Give three commercial uses of plant hormones.
Selective weedkillers, controlling the ripening of fruit and controlling dormancy.
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Other cards in this set

Card 2

Front

What do plant hormones do?

Back

They control the growth of shoots, roots, flowers and the ripening of fruits.

Card 3

Front

What is a tropism?

Back

Preview of the front of card 3

Card 4

Front

What is a positive tropism?

Back

Preview of the front of card 4

Card 5

Front

What is phototropism?

Back

Preview of the front of card 5
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