Biology- B6 Part D 0.0 / 5 ? BiologyInheritance, Variation and EvolutionGCSEAQA Created by: 13clarkenCreated on: 06-06-18 12:35 52310694187 Across 1. ... embryo screening: Increased prejudiced, people with genetic problems. Screening is expensive. Everyone may do it so they can choose the best baby (most desirable) (7) 5. Combining of genes from two parents causes ... variation -> some characteristics determined only by ... e.g. eye colour, hair colour etc (7) 6. ... 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 (6) 7. The ... including conditions, also cause differences within species -> ... variation -> Covers a wide range of differences (13) Down 2. 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 (11) 3. 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 (7) 4. Organisms of the same species will look slightly different. The differences are called ... within a species -> Genetic and environmental ... are the two types (9) 8. ... 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 (3) 9. Theory of ... : All of todays species have ... from simple life forms that first started to develop over 3 billion years ago (9) 10. ... 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 (6, 6)
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