inheritance Flashcards
what is a genotype
gene constitution for an organism (allele)
what is a phenotype
expression of genes and its interaction with the environment
what does homozygous mean
pair of homologus chromosomes carrying the same allele for a single gene
e.g AA, aa
what does hetrozygous mean?
pair of homologus chromosomes carrying 2 different alleles for a single gene
e.g Aa
what does reccessive allele mean
allele only expressed if no dominant allele is present
what does dominant mean
allele only expresed in the phenotype
what is codominant
both alleles are equally dominant and expressed in the phenotype
what is multiple alleles
more than 2 alleles for a single gene
what sex-linked
a gene whose locus is on the X chromosome
what is autosomal linkage
genes that are located on the same chromosome
what is epistasis
when one gene modifies or masks the expression of a different gene at a dofferent locus
what is a monohybrid cross
genetic inhertiance cross of a characteristic determined by one gene
what is a dihybrid cross
genetic inheritance cross of a charcteristic determined by 2 genes
what is a gene
small section of DNA which codes for a polypeptide
what is a allele
alternate form of gene
