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27 Cards in this Set
- Front
- Back
semilethals kill some individuals but not all of them. what influences the effect of semil lethals?
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the environment and other genes
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the creeper allele in chickens is a _____ allele?
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lethal
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creeper is lethal in the ____ form?
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homozygous
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the heterozygote exhibits phenotype that is intermediate?
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incomplete dominance
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example of incomplete domiance?
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four oclock plant color (pink is heterozygote)
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multiple alleles involve 3 or more alleles and are commonly found in _____?
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enzymes
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example of multiple alleles?
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coat color in rabbits
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what is another example of multiple alleles?
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ABO blood group
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alleles Ia and Ib are ______?
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codominant
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eosin eye color is an example of ___ ____ ____?
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gene dosage afffect
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phenomenom in which the heterozygous is more vigorous than coresponding homozygotes?
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overdominance (heterozygote advantage)
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sickle cell is an example of overdominance and is a ___ ____ disorder?
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autosomal recessive
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at the molecular level ____ is due to two alleles that produce slightly different protiens?
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overdominance
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when a dominant allele is not expressed in a heterozygote?
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incomplete penentrance
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example of incomplete penetrance?
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polydactyl
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two main types of sex traits?
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sex influenced and sex limited
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traits where an allele is dominant in one sex but recessive in the other?
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sex influenced
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example of sex influenced?
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pattern baldness
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pattern baldness is caused by an _____ gene?
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autosomal
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BB females are ____?
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bald
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Bb females are ___?
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bald
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bb females are ____?
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non bald
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traits that occur in one of the two sexes?
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sex limited traits
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example of sex limited?
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breast and beards
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another example of sex limited alleles?
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cock feathering in male chickens
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occurs when two or more DIFFERENT genes influence the outcome of a single trait?
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epistasis (gene interaction)
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investigated the two gene interactions?
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bateson and punnet
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