scence bioligy

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what does the nucleus of a cell contain?
chromosomes
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what are chromosomes made up of?
DNA
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what do different genes control?
the development of different characteristics
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what is the section of chromosome called?
genes
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what might variation may be due to?
genetic factors, environmental factors and a combination of genetic and environmental factors such as weight
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what are the two types of reproduction?
sexual reproduction and asexual reproduction
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what happens during sexual reproduction?
during sexual reproduction male and female gametes fuse together. This is called fertillisation. the genes carried by the egg and the sperm are mixed together to produce a new individual. this process produces lots of variation.
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what happens during asexual reproduction?
asexual reproduction doesnt produce any genetic variation at all. only one parent is needed, so there is no mixing genes. All offsprings are genetically identical to the parent i.e. clones.
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how to plants reproduce?
asexually
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explain the process of tissue culture?
small groups of cells are scraped from the part of a plant. The cells grown on agar containing nutrients and hormones.
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what happens to the offsprings in tissue culture?
they are genetically identical to the parent plant
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explain the process of embryo transplants?
cells from a developing animal embryo are split before they become specialised, the resulting identical embryos are transplanted into host mothers
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what happens to the offsprings in embryo transplants?
they are gentically identical to each other, but not to the parents
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explain the process of adult cell cloning?
the nucleus is removed from an unfertillised egg cell. The nucleus from an adult body cell, e.g. skin cell. an electric shock causes the egg cell to begin dividing to form an embryo. the embryo is inserted into the a host mother
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what happens to the offsprings in adult cell cloning?
they are genetically identical to the donor animal(that the nucleus came from)
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what does gentic modification involve?
it involves transferring genetic material from one organism to another
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what is the name that is called for the crops whos genes are modified?
its called genetically modified crops
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why do some people have concerns of GM crops?
The effect of GM crops on populations of wild flowers and insects also the effects of eating GM crops on human health
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in crop plants what might the desirable characteristics include?
improved yeild, improved resistance to pests or herbicides and a longer shelf life
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Card 2

Front

what are chromosomes made up of?

Back

DNA

Card 3

Front

what do different genes control?

Back

Preview of the front of card 3

Card 4

Front

what is the section of chromosome called?

Back

Preview of the front of card 4

Card 5

Front

what might variation may be due to?

Back

Preview of the front of card 5
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