16.2 Pre Class Review Questions

C

Huntington's disease is a devastating neurological disorder. If a child of an affected parent receives one copy of the Huntington allele, he or she will develop Huntington's disease. Thus, Huntington's disease is considered _____ trait. A) a recessive B) a neutral C) a dominant D) a reciprocal E) either a neutral or recessive

C

In a homozygous genotype: A) the individual will be phenotypically dominant. B) the two alleles for a given trait are different. C) both alleles for a given trait are the same. D) both alleles for a given trait are the same, and the individual will be phenotypically dominant. E) the individual will be phenotypically recessive.

D

In genetic crosses, the symbol Aa refers to a: A) phenotype. B) morphotype. C) archetype. D) genotype. E) holotype.

False

True-breeding plants are typically heterozygous for most genes. True False

C

What is an allele? A) a spontaneous mutation B) a circular strand of DNA capable of self-replication C) one of several different forms of a gene D) a group of unrelated genes seen in true-breeding stock E) the external appearance of an organism

C

Which of the following genotypes would result in a true-breeding stock? A) AA, but not Aa or aa B) Aa, but not AA or aa C) AA or aa, but not Aa D) AA or Aa or aa E) aa, but not Aa or AA