Gene Action Flashcards
2 types of gene action
Additive
Non-additive
non-additive gene actions
Dominance and recessiveness
Lack of dominance
Over dominance
Epistasis
Produces distinct phenotype
Non-additive gene action
Gene action that affects qualitative traits
Non-additive
Gene action where limited genes are involved
Non-additive
Gene action that affects quantitative traits
Additive
Both alleles are expressed in the phenotype when the genotype is heterozygous
Lack of dominance
The heterozygote is superior to both homozygote genotypes
Over dominance
Effect of hybridgor due to heterosis
Over dominance
Epistatic gene influences the expression of genes which are not their allelic pair
Epistasis
Cross involving a single trait
Monohybrid cross
Cross involving two traits
Dihybrid cross
Used to help solve genetics problems
Punnett square
Shows ratio of what is seen
Phenotypic ratios
Shows what is not seen
Genotypic ratios
Happens in the sex chromosomes
Sex-linkage
Linked genes or genes located in the same chromosomes tend to be inherited together
Autosomal linkage
Linked genes are separated by _____
Crossing over
Individuals appearing like parents
Parentals
Those appearing less frequently, products of crossing over
Recombinants
Inheritance outside the nucleus
Extra-nuclear inheritance
An individual’s height is influenced by the _____ health and condition during pregnancy
Mother’s
