Biology- B6 Part D

Created by: 13clarken
Created on: 06-06-18 12:35

Many genetic disorders can be detected. Remove a cell from ... and analyse genes. Get DNA from ... in womb and test for disorders. there are lot's of social, ethical and economic concerns. IVF -> after screening- ... with bad alleles are destroyed

Embryos

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... embryo screening: Increased prejudiced, people with genetic problems. Screening is expensive. Everyone may do it so they can choose the best baby (most desirable)

Against

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... embryo screening: Stops people suffering. Treating disorders costs the government and tax payer lots of money. There are laws to stop it going too far

For

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... showed that the height characteristic in pea plants was determined by separately inherited "hereditary units" passed on from each parent. The ratios of tall and dwarf plants in the offspring showed that the unit for tall plants (T) was dominant

Gregor Mendel

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Gregor Mendel reached 3 ... : -Characteristics in plants are determined by "hereditary units" -Hereditary units are passed on to offspring unchanged from both parents -Hereditary units can be dominant or recessive

Conclusions

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Organisms of the same species will look slightly different. The differences are called ... within a species -> Genetic and environmental ... are the two types

Variation

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Combining of genes from two parents causes ... variation -> some characteristics determined only by ... e.g. eye colour, hair colour etc

Genetic

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The ... including conditions, also cause differences within species -> ... variation -> Covers a wide range of differences

Environmental

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... introduce variations. Rarely, a ... can result in new phenotype in a species. With a change in environment, new phenotypes can be more suited to it and it becomes common throughout species -> Natural selection

Mutations

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Theory of ... : All of todays species have ... from simple life forms that first started to develop over 3 billion years ago

Evolution

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... found: Organisms have to compete for limited resources, organisms best suited to environment will survive -> survival of the fittest. Animals that do survive, will reproduce and pass on genes for the characteristics to survive. Species then evolv

Darwin

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Other cards in this set

Card 2

Front

... embryo screening: Increased prejudiced, people with genetic problems. Screening is expensive. Everyone may do it so they can choose the best baby (most desirable)

Back

Against

Card 3

Front

... embryo screening: Stops people suffering. Treating disorders costs the government and tax payer lots of money. There are laws to stop it going too far