Question 1

Which of the following best describes a genome?

Accepted Answer

All of the genetic information within an organism, including both coding and non-coding sequences.

Question 2

In which cellular compartment is the genome found in a typical animal cell?

Accepted Answer

Nucleus, mitochondria

Question 3

Which statement about chromosomes in eukaryotes is correct?

Accepted Answer

Each chromosome is a complex of a single linear DNA molecule and packaging proteins.

Question 4

What is the difference between a chromosome and a plasmid?

Accepted Answer

Chromosomes are linear DNA molecules in eukaryotes, while plasmids are circular DNA molecules in prokaryotes and organelles.

Question 5

In humans, coding genes make up approximately what percentage of the genome?

Accepted Answer

$$1\%$$

Question 6

A diploid organism has two sets of chromosomes. What is the term for the two copies of the same chromosome, one maternal and one paternal?

Accepted Answer

Homologous chromosomes

Question 7

Which of the following is an example of a polyploid organism?

Accepted Answer

Cultivated strawberries

Question 8

Which statement about genotype and phenotype is correct?

Accepted Answer

Phenotype is the observable trait, while genotype is the genetic makeup that can result in different phenotypes depending on environmental factors.

Question 9

If two different genes in the same metabolic pathway are mutated, what is a possible outcome?

Accepted Answer

The phenotype can be similar if both mutations block the same pathway.

Question 10

Which experiment would best determine the degree of genetic contribution to a trait?

Accepted Answer

Compare genetically identical mice raised in different environments.

Question 11

An allele is defined as:

Accepted Answer

A variant form of a gene that carries particular mutations.

Question 12

Which of the following is a source of naturally occurring alleles?

Accepted Answer

Replication errors during cell division

Question 13

Why do COVID-19 variants arise so frequently?

Accepted Answer

Viruses replicate rapidly and have low replication fidelity, leading to frequent mutations.

Question 14

Gregor Mendel's experiments with pea plants demonstrated that:

Accepted Answer

Traits are inherited as discrete units (genes) that can skip generations.

Question 15

Mendel observed a 3:1 ratio in the F2 generation for a single trait. What does this ratio represent?

Accepted Answer

Three dominant traits for every one recessive trait.

Question 16

Mutations in regulatory sequences of a gene can result in:

Accepted Answer

Altered transcription or translation, potentially leading to different alleles.

Question 17

A diploid individual can carry how many alleles for a given gene?

Accepted Answer

Two

Question 18

Which of the following statements about alleles is correct?

Accepted Answer

Different alleles may produce different phenotypes depending on changes in protein quantity or function.

Question 19

Which of the following is a misconception about mutations?

Accepted Answer

Mutations always give rise to superpowers.

Question 20

In the ABO blood type system, which genotype results in type AB blood?

Accepted Answer

AB

Lecture 1: The Language of Genetics – Foundations and Key Concepts

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