Inheritance, varitation and evoloution 4.0 / 5 based on 1 rating ? BiologyEvolution, extinction and natural selectionGCSEAQA Created by: LBeb01Created on: 07-05-18 13:46 How many cells are produced at the end of mitosis 2 1 of 48 How many cells are produced at the end of meiosis? 4 2 of 48 What are the male gametes in plants? Pollen 3 of 48 What are the female gametes in plants? Eggs 4 of 48 What is the male gamete in animals Sperm 5 of 48 What is the female gamete in animals Eggs 6 of 48 What is the basic structue of DNA? Double Helix 7 of 48 Define gene Section of DNA that controls a characterstic 8 of 48 Define chromosome long molecule of DNA 9 of 48 Define allele Different versions of DNA 10 of 48 Define dominant Only needs one allele to be present of phenotype 11 of 48 Define recessive 2 versions of gene needs to present itself 12 of 48 Define homozygous 2 identical copies of the gene 13 of 48 Define genome all of the DNA within a organisum 14 of 48 Define gamete All the DNA of an organisum 15 of 48 Define hetrozygous Diffrerent copies of the same gene 16 of 48 Define genotype Genes that you have 17 of 48 Define phenotype The charasterisics that you have 18 of 48 What is polydactyly? When you have extra fingers or toes 19 of 48 Is polydatyly dominant or recessive? Dominant 20 of 48 What is cystic fibrosis? Build up of mucus in the lungs 21 of 48 Is cystic fibrosis dominant or recessive? recessive 22 of 48 How many pairs of hromosomes in a human body cell? 23 23 of 48 What sex is ** Female 24 of 48 What sex is XY Male 25 of 48 Define evolution When species gradually change over time 26 of 48 Define natural selection Process by which species evolve 27 of 48 Define speciation Devlopement of a new species 28 of 48 What evidence is there for evolution The fossil record 29 of 48 How do fossil arise? Bones 30 of 48 Define extinction A species dying out 31 of 48 What things lead up to extinction Increase in predator/hunting, decrease in food or change in the envroment 32 of 48 Why can baceria evolve quickly? Because they divide every 20 minitues 33 of 48 What is MRSA? Multi drug resistant bacteria 34 of 48 Why is the development of antiboitics so slow? Lots of work involved -little incentive for drug companies 35 of 48 What are the advantages of sexual reproduction? Variation 36 of 48 What are the disadvatages of sexual reproduction? Gene dilution 37 of 48 What are the advantages of asexual reproduction Clone, no looking for partner 38 of 48 What are the disadvatges of asexual reproduction? Lack of variation 39 of 48 What is the basic structure of DNA? Double helix 40 of 48 What are the bases of DNA? AT CG 41 of 48 How does DNA code for amino acids? Sets of 3 bases - codons 42 of 48 How do amino acids prodce protiens? Long strings fold up to make protiens 43 of 48 How do variations of DNA affect the protien being made? Protiens mis folding - wrong shape -- Enzymes active site is wrong 44 of 48 What affect might a mutation have on an enzyme? Active site is wrong 45 of 48 What was Darwins theory? Evolution, gradual changes over time 46 of 48 What was the controversy behind Dawins theory? Because it went against God 47 of 48 What was the Lamaracks Theory? Characteristics is aquired during a life time and are passed on 48 of 48
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