genetics 0.0 / 5 ? BiologygeneticsGCSEEdexcel Created by: keyaan MartinCreated on: 26-04-17 19:44 What happens in meiosis a type of cell division that makes gametes 1 of 9 Where does it take place in the testis or ovaries 2 of 9 What are DNA bases Adenine, thymine,cytosine and guanine. A and T link like C and G 3 of 9 How are DNA strands held together Weak hydrogen bonding 4 of 9 What is the difference a gene and an allele? Different forms of the same gene are called Alleles 5 of 9 Why willa recessive allele not affect the phenotype of an organism that is heterozygous for that gene Because a dominant allele is more powerful then a recessive 6 of 9 How is the sex of offspring deteremined in Humans The baby will be a girl if it carries an X chromosome. It will be a boy if the fertilising sperm carries a Y chromosome. 7 of 9 What is a mutation Mutation is a change in a gene that creates a new allele 8 of 9 How is genetic variation caused Genetic variation is caused by the different alleles inherited during sexual reproduction 9 of 9
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