Genetics + DNA Review

In a plant that has red flowers, red flower color (R) is dominant to white flower color (r). If the plant is heterozygous for flower color, which alleles will be carried by the gametes it produces?

• R and r

• R only

• r only

• Rr only

Timothy has attached earlobes like his maternal grandfather. His mother and father both have free earlobes, which are dominant. Which statement best explains how Timothy inherited attached earlobes?

• He received a recessive allele from each parent

• He received a dominant allele from each parent

• He received a recessive allele from his mother and a dominant allele from his father

• He received a dominant allele from his mother and a recessive allele from his father

Mustard gas removes guanine from DNA. This can cause serious multiple deformities because guanine ...

• is one of the nitrogenous bases of DNA

• forms all the connections between bases in DNA

• supports the structure of ribosomes

• produces energy for the transfer of genetic information

In eukaryotic cells, the process of DNA --> mRNA occurs in the ________.

• cytoplasm

• ribosome

• nucleus

• cell membrane

The model of DNA used today was proposed by James Watson and Francis Crick in 1953. In this model, what sequence of bases would be complementary to

A-G-C-T-A?

• A-G-C-T-A

• C-G-C-A-T

• A-T-C-G-A

• T-C-G-A-T

The chances of developing cancer, diabetes, or sickle cell anemia are higher if a family member also has the disease because they are

• highly infectious

• passed through blood contact

• genetic

• related to diet

What was Chargaff's contribution to the discovery of the structure of DNA?

• He built the first logical model

• He took an x-ray diffraction photograph of DNA

• He discovered the anti-parallel nature of DNA

• He discovered the complimentary base pairing of DNA

Where does translation occur?

• mitochondria

• cytoplasm

• ribosomes

• nucleus

Which comes first?

• DNA replication

• Transcription

• Translation

Which of the following is most responsible for carrying coded information from the nucleus?

• cell membrane

• ribosomes

• ATP

• mRNA