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925629
Genetic Variation and its Control - B1
Descrição
GCSE Biology (B1) Mapa Mental sobre Genetic Variation and its Control - B1, criado por Georgia Freeman em 24-05-2014.
Sem etiquetas
b1
biology
genes
aqa
gcse
genetic variation
biology
b1
gcse
Mapa Mental por
Georgia Freeman
, atualizado more than 1 year ago
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Criado por
Georgia Freeman
mais de 10 anos atrás
284
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0
Resumo de Recurso
Genetic Variation and its Control - B1
There are differences of course between different species of plants and animals, there are also differences between individuals of the same species.
the differences are due partly to the info in cells that they've inherited from their parents.
also, partly from the different environments in which the individuals live and grow
GENETIC CONTROL
Asexual reproduction can be used to produce individuals that are genetically identical to their parent.
Scientists can now add, remove or change genes to produce the plants and animals they want.
Why organisms are different
similar characteristics = found in genes
genes are passed on in the sex cells(gametes) from which offspring develop
the nucleus of the cell contains the CHROMOSOMES
CHROMOSOMES carry the genes
different genes control the development
of different characteristics of an organism
variation can be caused by the conditions in which the organism has developed
(ENVIRONMENTAL FACTORS)
REPRODUCTION
SEXUAL REPRODUCTION
is the joining (fusing) of male and female gametes
the mixing of the the genetic info of the two parents leads to genetic variation in the offspring
ASEXUAL REPRODUCTION
involves only one parent and the offspring are genetically identical (clones)
CLONING TECHNIQUES
plants can be grown from cuttings of a parent plant
TISSUE CULTURE
- using small groups of cells from the parent plant to produce large numbers of plant
EMBRYO TRANSPLANTS
- splitting apart cells in an embryo and implanting them into host mothers
ADULT CLONING
- removing a nucleus from an egg cell and inserting one from a body cell: after treatment, the embryo is implanted into a womb
Adult animals that have outstanding features can be cloned for meat or milk production.
1. The nucleus is removed from an unfertilised egg cell
2. a nucleus from a body cell is inserted into the egg cell
3. the cell is triggered to divide via electric shocks
4. this embryo has identical genetic info to the body cell
5. this embryo is inserted into the host womb
its development continues to produce a clone of the parent
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