Reproduction 0.0 / 5 ? BiologyVariation and reproductionGCSEAQA Created by: IJM22Created on: 24-03-19 16:14 How many pairs of human chromosomes do human contain? 23 Pairs of chromosomes 1 of 33 What happens in Mitosis? One cell is copied into two identical cells 2 of 33 In humans, what are gametes? Sperm cells and egg cells 3 of 33 How are gametes made? By a process called meiosis 4 of 33 What does meisois produce? Non-identical cells 5 of 33 Where else does meisois take place? In flowering plants 6 of 33 What are the features of the sexual reproduction? 1) Sexual reproduction involves the fusion of male and female gametes 7 of 33 What happens in sexual reproduction? There is a mixing of genetic information 8 of 33 Give an example of asexual reproduction? An Aphid reproducing 9 of 33 What does asexual reproduction? Only one parent 10 of 33 What does asexual reproduction involve? Only mitosis 11 of 33 Where does meiosis take place? In reproductive organs 12 of 33 What does Meiosis do to the chromosomes? They halve them 13 of 33 How many gametes do Meiosis produce? Produces 4 gametes from one original cell 14 of 33 In fertilisation, what happens to the chromsomes? In fertilisation, what happens to the chromsomes? 15 of 33 What do chromosomes contain? Contain the molecule DNA 16 of 33 What does DNA consist of? Two strands 17 of 33 What is each strand in a DNA called? Polymer 18 of 33 How is each strand made in the DNA? By the joining of smaller molecules 19 of 33 How is a double helix? Two strands wrap around each other 20 of 33 What is the definiton of a gene? A small section of DNA on a chromosome 21 of 33 What is the gene for blood type? Chromosome 9 22 of 33 How are proteins made? By the joining of amino acids 23 of 33 Define genome? Entire genetic material of an organsim 24 of 33 What are the benefits of understanding the genome? 1) It will help us to treat inherited disorders 2) Use it to trace human migration patterns from the past 25 of 33 What is Cystic Fibrosis? A disorder of cell membranes 26 of 33 What is Cystic Fibrosis controlled by? One single gene 27 of 33 How many alleles does Cystic Fibrosis? 2 alleles 28 of 33 What is the allele for defective cell? A capital C which is recessive 29 of 33 What must a person have to have Cystic Fibrosis? Two copies of the defective allele 30 of 33 How is Polydactyly caused? By a dominant allele 31 of 33 What must a person have in order to have Polyfactyly? One copy of Polydactyly and one copy of the nomal allele 32 of 33 What happens in embryo screening? Embryos are tested to see if they have the alleles for inherited disorders 33 of 33
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