BIO 152 – VCU UPDATED ACTUAL
Exam Questions and CORRECT Answers
genes - CORRECT ANSWER - regions of DNA that code for specific functions
Chromosomes are made up of? - CORRECT ANSWER - DNA and proteins
alleles - CORRECT ANSWER - different forms of genes (alternative forms of a gene)
Explain difference b/t gene and allele. (i.e. in eyelash length) - CORRECT ANSWER -
The gene codes for the character "eyelash", and alleles determine the character trait, which is the
length of eyelashes (short or long).
complete dominance - CORRECT ANSWER - when the phenotype of the heterozygote
and the dominant homozygote are indistinguishable; dominant allele is expressed even when
recessive trait is present (i.e. heterozygous genotype)
incomplete dominance - CORRECT ANSWER - when neither allele is completely
dominant, and the hybrids have a phenotype somewhere between those of the two parental
varieties (i.e. red flower + white flower => pink flower b/c neither has strong enough dominance)
codominance - CORRECT ANSWER - a condition in which both alleles for a gene are
fully expressed; the two alleles each affect the phenotype in separate, distinguishable ways
epistasis - CORRECT ANSWER - when the phenotypic expression of a gene at one locus
alters the expression of that gene at at a second locus
pleiotropy - CORRECT ANSWER - when one gene has multiple phenotypic
effects/expressions
Exam Questions and CORRECT Answers
genes - CORRECT ANSWER - regions of DNA that code for specific functions
Chromosomes are made up of? - CORRECT ANSWER - DNA and proteins
alleles - CORRECT ANSWER - different forms of genes (alternative forms of a gene)
Explain difference b/t gene and allele. (i.e. in eyelash length) - CORRECT ANSWER -
The gene codes for the character "eyelash", and alleles determine the character trait, which is the
length of eyelashes (short or long).
complete dominance - CORRECT ANSWER - when the phenotype of the heterozygote
and the dominant homozygote are indistinguishable; dominant allele is expressed even when
recessive trait is present (i.e. heterozygous genotype)
incomplete dominance - CORRECT ANSWER - when neither allele is completely
dominant, and the hybrids have a phenotype somewhere between those of the two parental
varieties (i.e. red flower + white flower => pink flower b/c neither has strong enough dominance)
codominance - CORRECT ANSWER - a condition in which both alleles for a gene are
fully expressed; the two alleles each affect the phenotype in separate, distinguishable ways
epistasis - CORRECT ANSWER - when the phenotypic expression of a gene at one locus
alters the expression of that gene at at a second locus
pleiotropy - CORRECT ANSWER - when one gene has multiple phenotypic
effects/expressions
