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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 |