BIOL121 Lecture Notes - Lecture 16: Insulin, Hemoglobin A, Abo Blood Group System
4 Sep 2018
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Document Summary
Wrapped around proteins and gets condensed into chromosomes before and during cell division. Sequence of dna contains information about all proteins in the body. Alleles are different variants of a gene e. g. functional insulin and non-functional insulin. Alleles are different variants of a gene e. g. functional insulin and non-functional insulin e. g. an antigen or b antigen on rbc. Genes can have many different alleles e. g. blue eyes vs brown eyes vs green eyes. Genotype: the genetic composition of an individual. Your phenotype is unique, not even identical twins are completely identical. We inherit two copies of each gene (mum and dad) A person can by homozygous or heterozygous at a gene. Heterozygous individuals have 2 different sets of instruction which to follow. Dominant/recessive: one allele is always expressed (dominant), and the other is ignored. Recessive allele can only be expressed if no dominant allele is present (e. g. homozygous recessive) Two copies of each time of chromosome: mum and dad.
