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AgEnt2 genetics3
extending mendelian genetics
Question | Answer |
---|---|
Epistasis | a gene alters the phenotype at a different locus..coat colour in labradors |
incomplete dominance | intermediate form of gene expressed |
codominance | both genes expressed |
multiple alleles | more than two alleles for a gene |
lethan white overo(LWO) | two copies of mutated gene in horses |
dexters | bulldog calves, extreme dwarfism.chondrodysplasia |
pleiotropy | a gene at 1 locus effects more than 1 characteristic or phenotype for example goats, polled and intersexed. and sickle cell anaemia |
in multiple gene conditions | each dominant allele has a quantitative effect on phenotype. height and weight for example |
dominant | if a trait is present in a heterozygote |
recessive | trait only present in homozygous condition |
co dominance | more than one allele is fully expressed |