Question 1

Which phase of the eukaryotic cell cycle is responsible for the duplication of DNA, and what is the consequence if this phase fails to accurately replicate the genome?

Accepted Answer

S phase; failed replication can result in mutations or cell cycle arrest

Question 2

During mitosis, each chromosome consists of two identical DNA molecules. What are these structures called, and how are they held together?

Accepted Answer

Chromatids; held together by centromeres

Question 3

A diploid human cell contains $$2n$$ chromosomes. After meiosis II, how many chromosomes are present in each daughter cell, and what is the genetic relationship between these cells?

Accepted Answer

$$n$$ chromosomes; cells are genetically unique due to crossing over and independent assortment

Question 4

Which process is primarily responsible for reducing the chromosome number by half in sexually reproducing organisms?

Accepted Answer

Meiosis I

Question 5

Artificial selection in plants, such as the development of modern maize from teosinte, is an example of which genetic principle?

Accepted Answer

Selective breeding targeting specific alleles for desirable traits

Question 6

A karyotype is used to visualize chromosomes. Which of the following statements about karyotyping is correct?

Accepted Answer

It arranges chromosomes by size, shape, and number to detect abnormalities

Question 7

In forensic genetics, how was the Golden State Killer identified using modern genetic techniques?

Accepted Answer

By comparing DNA from crime scenes to profiles in genealogy databases

Question 8

Which equation correctly represents the total length of DNA in a human body, given that each cell contains approximately 2 meters of DNA and the body has about $$10^{13}$$ cells?

Accepted Answer

$$2 	imes 10$$^{13}$$ meters

Question 9

Which of the following best explains why chromosome number does not directly correlate with organismal complexity?

Accepted Answer

Chromosome number is shaped by evolutionary pressures and speciation events, not complexity

Question 10

In the context of genetics, what is the difference between genotype and phenotype?

Accepted Answer

Genotype is the set of genes; phenotype is the set of observable traits

Question 11

Which checkpoint in the cell cycle ensures that all chromosomes are properly attached to the spindle before proceeding to anaphase?

Accepted Answer

M checkpoint (spindle assembly checkpoint)

Question 12

A plant species is selectively bred for non-shattering ears, making it easier to harvest. What genetic mechanism is most likely responsible for this trait becoming common in domesticated populations?

Accepted Answer

Artificial selection favoring alleles for tough rachis

Question 13

Which of the following is a real-world consequence of inbreeding, as illustrated by the Habsburg family?

Accepted Answer

Higher risk of inheriting recessive disorders and developmental delays

Question 14

Which statement best describes the role of meiosis in generating genetic diversity?

Accepted Answer

Meiosis involves crossing over and independent assortment, shuffling alleles

Question 15

If a mutation causes the loss of function in an enzyme responsible for pigment production in flowers, what is the most likely phenotype?

Accepted Answer

Flowers will be white due to absence of pigment

Question 16

Which of the following best describes the difference between homologous chromosomes and sister chromatids?

Accepted Answer

Homologous chromosomes have the same genes but different alleles; sister chromatids are identical copies formed during DNA replication

Question 17

Which equation represents the reduction in chromosome number during meiosis from diploid ($$2n) to $$haploid ($$n$$)?

Accepted Answer

$$2n \rightarrow n$$

Question 18

Which of the following is NOT a direct application of genetics in modern society?

Accepted Answer

Determining blood type by visual inspection

Question 19

Why is regular practice and engagement in class shown to improve exam scores in genetics courses?

Accepted Answer

It enhances metacognition and long-term retention of material

Question 20

Which of the following best explains the importance of checkpoints in the cell cycle?

Accepted Answer

They verify DNA integrity and proper chromosome segregation to prevent mutations and aneuploidy

Introduction to Genetics: Cell Division, Chromosomes, and Applications

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