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a gene at one locus alters phenotypic expression of gene at second locus


where recessive allele in heterozygotes may be transmitted to their offspring

chromosome theory of inheritance

mendelian genes have specific positions along chromosomes and its the chromosomes that undergo segregation and independent assortment

sex-linked gene

a gene located on either chromosome

barr body

inactive X chromosome in female, reactivated in the cells that give rise to eggs

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