genetics definitions Flashcards
What is a gene?
= encodes for a specric amino acid,
What is an allele?
= alternative forms of a gene
what is a locus?
= position of a gene on a chromosome
What are homologous chromosomes?
= chromosomes containing genes for the same characteristics and same loci
what is a phenotype?
= obseverable characteristic
What is the genotype?
= genetic composition of an organism , combination of alleles controling phenotype
Homozogous?
= alles are idential TT
Heterozygous?
Tt
What is a dominant allele?
= expressed in the phenotype eveb in the pressence of a resssive allele
What is a recessive allele?
= only expressed in the phenotype, if there is no dominant allele
What is codominance?
= both are equally domiant, expressed in phenotype
= both are expressedin the phenotype
What is multiple alleles?
=more than 2 allele for a single gene
What is sex linkage?
= a gene whose locus is on X chromosome
What is autosomal linkage?
= gene located on the same chromsome, not the sex chromosome
What is epistatis?
= when one gene modifies or masks the expression of a different gene on a different locus
