Inheritance Key Terms Flashcards
(Miss Estruch vid)
Genotype
The genetic constitution of an organism (the alleles it has for a gene)
Phenotype
The expression of the genes and its interaction with the environment
Homozygous
A pair of homozygous chromosomes carrying the same alleles for a single gene
Heterozygous
A pair of homologous chromosomes carrying two different alleles for a single gene
Recessive allele
An allele only expressed if no dominant allele is present
Dominant allele
an allele that will always be expressed in the phenotype
Codominant
both alleles are expressed in the heterozygote resulting in a different phenotype
Multiple alleles
More than two alleles for a single gene
Sex-linkage
A gene whose locus is on the X (or Y) chromosome
Autosomal linkage
Genes that are located on the same chromosome (not the sex-chromosomes)
Epistasis
When one gene modifies or masks the expression of a different gene at a different locus
Monohybrid
Genetic inheritance cross of a characteristic determined by one gene
Dihybrid
Genetic inheritance cross for a characteristic determined by two genes
