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