Honors Human Genetics Test Version

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Autosomal traits

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Traits influenced by a gene found on any of the autosomes; affect genders equally

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Sex-linked Traits

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Traits controlled by genes located on X chromosome

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Dominant traits

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Never skip a generation (NO carriers); every affected individual has at least one affected parent

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Recessive traits

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Skip generations (bc parents are carriers); affected individuals do NOT have affected parents

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Sex-linked traits in females

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Affected females must have an affected father & at least a carrier mother; females can be carriers

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Sex-linked traits in males

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Males only need one recessive allele to have trait, this is inherited from mom; affected males must have at least a carrier mother

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Carrier

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Heterozygous individual - unaffected but can pass on recessive allele

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TH Morgan

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Discovered sex-linked traits and showed that genes are located on chromosomes

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Pedigree

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A diagram that shows the occurrence of a genetic trait in several generations of a family

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Sex-linked carrier

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Heterozygous female (NEVER males!)