Question

1. The four nucleotides found in human DNA (G, A, T, C) combinein groups of three to create potentially 64 different amino acids,but only 20 amino acids, one start codon and three stop codons areused to construct proteins. Why is this so?

a.Many amino acids are not considered complete until they bindwith a second amino acid.
b.64 amino acids are produced, but the body only integrates
c.42 of them into proteins. 64 amino acids are initially produced,but 42 of them are unstable and degrade immediately. Differentd.nucleotide combinations code for the same amino acid.

2.What term is used to describe the phenomenon that there are 64different groups of 3 nucleotides to code for amino acids but only20 amino acids, 1 start codon, and 3 stop codon used in proteinconstruction.

a.Crossing over
b.Redundancy
c.DNA structure
d.Transcription

Suppose a male and a female with chromosomes "DD" (male) and"dd" (female) crossbreed. How likely is their offspring to exhibitthe DD genotype?

100%
25%
50%
0%

4.What term best describes the genotype of "dd"?
a.heterozygous
b.monohybrid
c.homozygous
d.haploid

5.Suppose a male and a female with chromosomes "DDBb" (male) and"ddBB" (female) interbreed. How likely is their offpsring toexhibit the DdBb genotype? 100% 50% 25% 0%?

6. What term best describes the breeding perfomed when a maleand female with chromosomes "DDBb" (male) and "ddBB" (female)interbreed?

Dihybrid cross

Codominance

Incomplete dominance

Monohybrid cross