Correct Answers are in bold; note that there are two possible correct answers for #4.
#1. (5 points) An allele is:
a) the homozygous genotype
b) the heterozygous genotype
c) one of many possible forms of a gene
d) another word for a gene
#2. (5 points) You perform a testcross involving two genes, D and E, each with two alleles showing simple dominant/recessive relationships. D is dominant to d, and E is dominant to e. Which of the following crosses accurately describes a testcross involving these genes?
a) An individual with both dominant phenotypes, crossed with a DD, EE
b) An individual with one dominant and one recessive phenotype, crossed with a DD, EE
c) An individual with both dominant phenotypes, crossed with a dd, ee
d) An individual with one dominant and one recessive phenotype, crossed with a dd, ee individual
#3. (5 points) You are studying Mendel’s peas and have set up a cross between a true-breeding plant with round peas and a true-breeding plant with wrinkled peas. The round phenotype is dominant to the wrinkled phenotype. You then perform a F1 x F1 cross and analyze 400 F2 How many F2 plants do you expect to have the round pea phenotype?
a) 400
b) 300
c) 100
d) 0
#4. (5 points) Two genetic mutants of Neurospora crassa are defective in the Alanine biosynthesis pathway. After complementation testing, the two mutants were placed into different complementation groups. Which of the following statements most accurately describes the two mutants:
a) they must have mutations in different specific genes
b) they must have mutations at different exact nucleotide positions
c) they must have mutations in the same specific gene
d) they must have mutations at the same exact nucleotide positions
e) both A and B are true
f) both C and D are true
