genetics 0.0 / 5 ? BiologyDNA, genetics and evolutionASAQA Created by: divya123Created on: 07-12-20 14:36 phenotype observable characteristics of an organism - result of the interaction between the expression of the genotype and the environment 1 of 16 genotype - genetic makeup of an organism - describes all the alleles an organism has 2 of 16 gene - is a length of DNA that is a sequence of nucleotide bases that normally code for a particular polypeptide 3 of 16 alleles - one of the different forms of a gene 4 of 16 homozygous recessive both alleles recessive 5 of 16 homozygous dominant both alleles dominant 6 of 16 heterzygous one dominant one recessive 7 of 16 co dominant both alleles are expressed in the phenotype 8 of 16 multiple alleles where there are more than two alleles where both are equally dominant both alleles of a gene is expressed in the phenotype 9 of 16 example of multiple allels in blood groups 1o 1a 1b 10 of 16 sex linkage a gene that is carried either on X or Y chromosome (no alleles on Y ) 11 of 16 pedigree charts - male square - female circle 12 of 16 autosomal linkage any two genes that occur on the same chromosome than isnt a a sex chromosome 13 of 16 epistasis when the allele of one gene masks the expression of another in the phenotype 14 of 16 when to use dihybrid crosses when looking at two different traits e.g. seed colour and shape 15 of 16 when to look at monohybrid crosses when only looking at one trait 16 of 16
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