Genes and Inheritance 0.0 / 5 ? BiologyDNA and inheritanceGCSEAQA Created by: RGV17Created on: 21-09-16 16:51 What is a allele? A version of a gene. 1 of 10 Why does variation between individuals occurs? This is because each gene occurs in different forms which are alleles. 2 of 10 Describe the DNA structure. A double-helix running anti-parallel connected by base pairs. 3 of 10 What did Gregor Mendel do? Experimented with peas of different types and discovered there were units of inheritance and the same characteristics were dominant over others. 4 of 10 What is phenotype? What it looks like- the visible characteristics. 5 of 10 What is genotype? Allele's presence written as Yy, YY or yy. 6 of 10 What are dominant alleles? Alleles that controls the characteristics when they're only present on one of the chromosomes. 7 of 10 What are recessive alleles? Only controls the characteristics if they're present on both the chromosomes. 8 of 10 What are homozygous alleles? When both the alleles are the same: homozygous dominant- BB and homozygous recessive- bb 9 of 10 What are heterozygous alleles? When in a pair of genes, one is dominant and one is recessive. 10 of 10
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