Biology? genetics? questions?

1) When is amniocentesis usually done?


A) during the ninth month of pregnancy


B) prior to the fourth week of pregnancy


C) after the birth of the child


D) between weeks fourteen and twenty of pregnancy


E) during the third trimester





2) True-breeding plants ___.


A) self-fertilize to produce offspring identical to the parent


B) cannot be cross-fertilized


C) produce sterile offspring when cross-fertilized


D) self-fertilize to produce hybrid offspring


E) become sterile after three generations





3) What is the key to the recognition of a trait whose expression is determined by the effects of two or more genes (polygenic inheritance)?


A) The trait exhibits a continuous distribution.


B) A mating between a homozygous and a heterozygous individual produces more than the expected number of offspring expressing the dominant.


C) All of the alleles of the gene for that trait are equally expressed.


D) Pleiotropy occurs.


E) A mating between a homozyg

Biology? genetics? questions?
1) When is amniocentesis usually done?


D) between weeks fourteen and twenty of pregnancy


http://www.marchofdimes.com/professional...





2) True-breeding plants ___.


A) self-fertilize to produce offspring identical to the parent


http://biology.about.com/library/glossar...





3) What is the key to the recognition of a trait whose expression is determined by the effects of two or more genes (polygenic inheritance)?


A) The trait exhibits a continuous distribution.


http://en.mimi.hu/biology/polygenic_inhe...


(see fourth definition)

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