DC Biology Final, Part 2

Which of the following best describes a genotype?

• Physical characteristics of an organism

• Set of observable characteristics of an organism

• Combination of alleles an organism has for a specific trait

• Way in which genes are expressed in an organism

In a dihybrid cross involving two traits, what is the ratio of phenotypes in the F2 generation?

• 9:3:3:1

• 3:1

• 1:2:1

• 1:1

A DNA molecule consists of:

• Two strands that run parallel to each other

• Three strands

• A single strand

• Four strands

Which of the following best defines codominance?

• One allele is completely dominant over another

• Both alleles contribute to the phenotype of the heterozygote

• Alleles segregate independently during gamete formation

• Heterozygotes have an intermediate phenotype

How many chromosomes are present in a normal human gamete?

• 23

• 46

• 22

• 44

What is the term for the physical expression of an organism's genes?

• Genotype

• Mutation

• Phenotype

• Locus

Which of the following is an example of polygenic inheritance?

• Blood type

• Height

• Attached earlobes

• Widow's peak

The production of a protein from mRNA is known as:

• Transcription

• Translation

• Replication

• Mutation

Which type of mutation results in the insertion or deletion of nucleotides?

• Point mutation

• Silent mutation

• Frameshift mutation

• Missense mutation

An individual's blood type is an example of:

• Multiple alleles

• Codominance

• Polygenic inheritance

• Incomplete dominance