Q: Which of the following best describes the flow of genetic information in a eukaryotic cell?

$$\text{DNA} \rightarrow \text{RNA} \rightarrow \text{Protein}$$

Question 1

Which of the following best describes incomplete dominance as observed in snapdragon flower color inheritance?

Accepted Answer

The heterozygote displays an intermediate phenotype between the two parental varieties.

Question 2

A person with genotype $$I^A I^B$$ for the ABO blood group will have which blood type, and why?

Accepted Answer

Type AB, because both $$I^A$$ and $$I^B$$ alleles are codominant and both are expressed.

Question 3

Which of the following is an example of pleiotropy?

Accepted Answer

A single gene influencing multiple phenotypic traits, such as sickle-cell disease affecting red blood cell shape, anemia, and malaria resistance.

Question 4

In sickle-cell disease, what is the relationship between genotype and phenotype at the molecular and organismal levels?

Accepted Answer

At the organismal level, heterozygotes show incomplete dominance; at the molecular level, both alleles are codominant.

Question 5

Which of the following best explains polygenic inheritance?

Accepted Answer

Multiple genes contribute additively to a single phenotypic trait, such as human skin color.

Question 6

A child is born with type O blood. Which of the following parental genotype combinations could produce this child?

Accepted Answer

Mother: $$I^A i$$, Father: $$I^B i$$

Question 7

Which of the following statements about the chromosomal theory of inheritance is correct?

Accepted Answer

Genes occupy specific loci on chromosomes, and chromosomes undergo segregation and independent assortment during meiosis.

Question 8

Linked genes are most likely to:

Accepted Answer

Be inherited together because they are located close to each other on the same chromosome.

Question 9

A male fruit fly with genotype $$X^rY ($$white-eyed) is crossed with a female with genotype $$X^R X^r ($$heterozygous red-eyed). What proportion of their male offspring will have white eyes?

Accepted Answer

$$50\%$$

Question 10

Which of the following best describes the inheritance pattern of hemophilia in humans?

Accepted Answer

X-linked recessive

Question 11

Why do mitochondrial DNA and Y chromosome DNA provide unique insights into human ancestry?

Accepted Answer

They are inherited without recombination, allowing tracing of direct maternal and paternal lineages.

Question 12

Which of the following best describes the flow of genetic information in a eukaryotic cell?

Accepted Answer

$$	ext{DNA} ightarrow 	ext{RNA} ightarrow 	ext{Protein}$$

Question 13

A mutation changes the DNA sequence from $$GAA to$$ $$GAG. $$Both codons encode for glutamic acid. What type of mutation is this?

Accepted Answer

Silent mutation

Question 14

Which of the following is true about the genetic code?

Accepted Answer

The code is redundant, meaning multiple codons can encode the same amino acid.

Question 15

Which process involves the removal of introns and the joining of exons in eukaryotic cells?

Accepted Answer

RNA splicing

Question 16

Which of the following best describes the role of tRNA during translation?

Accepted Answer

tRNA brings specific amino acids to the ribosome based on codon-anticodon pairing.

Question 17

A single nucleotide insertion in a coding sequence is most likely to result in:

Accepted Answer

A frameshift mutation

Question 18

Which of the following is true about prions?

Accepted Answer

They are infectious proteins that can cause brain diseases by inducing misfolding of normal proteins.

Question 19

Which of the following immune cells is responsible for presenting antigens to T cells and initiating adaptive immune responses?

Accepted Answer

Dendritic cells

Question 20

Which of the following best describes the difference between innate and adaptive immunity?

Accepted Answer

Innate immunity is immediate and non-specific, while adaptive immunity is slower and highly specific.

Non-Mendelian Genetics, Chromosomal Inheritance, and Molecular Biology: Study Guide

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