Question 1

Which of the following processes is a major driver of genetic diversity during gamete formation in eukaryotes?

Accepted Answer

Meiotic recombination (crossing over)

Question 2

During meiosis, independent assortment of chromosomes occurs. For humans, how many possible combinations of chromosomes can result from this process?

Accepted Answer

$$2^{23} = 8$$,388,608$$

Question 3

In higher animals, why are eggs more susceptible to environmental mutagens compared to sperm?

Accepted Answer

Eggs are formed early and stored for long periods, increasing exposure to mutagens

Question 4

Which statement best explains why sexual organisms divide their genes onto multiple chromosomes?

Accepted Answer

To allow for independent assortment and increase genetic diversity

Question 5

If a human has 23 pairs of chromosomes, what is the theoretical number of possible gamete combinations due to independent assortment alone?

Accepted Answer

$$2^{23}$$

Question 6

Which of the following is NOT a major engine of genetic diversification in higher plants and animals?

Accepted Answer

Binary fission

Question 7

Why do X and Y chromosomes in higher animals generally not recombine during meiosis?

Accepted Answer

They have evolved to suppress recombination due to their divergence from autosomal homologs

Question 8

A plant’s shoot apical meristem (SAM) contains stem cells that eventually give rise to floral meristems. What is the significance of the quiescent center (QC) in this process?

Accepted Answer

It maintains low-rate mitotic activity, reducing mutation rates in stem cells

Question 9

If a rare recombination event occurs at a locus with 1000 genes, how many possible combinations of alleles can be generated at that locus?

Accepted Answer

More than $$1000^{2}$$ possible combinations

Question 10

Which process ensures that no two siblings (except identical twins) are genetically identical?

Accepted Answer

Meiotic recombination and independent assortment

Question 11

Calculate the number of ancestors a person has 15 generations ago, assuming no ancestors are related to each other.

Accepted Answer

$$2^{15} = 32$$,768$$

Question 12

Which of the following best describes the additive and exponential nature of genetic diversification across generations?

Accepted Answer

Each generation independently diversifies, and progeny multiply exponentially

Question 13

Why is genetic diversification important for the survival of a species?

Accepted Answer

It increases the likelihood that some individuals will survive new diseases or environmental changes

Question 14

Which of the following is a consequence of combining genomes from different ancestral lineages during sexual reproduction?

Accepted Answer

Increased genetic diversity in offspring

Question 15

In plants, why is the germline NOT set aside early in development, unlike in higher animals?

Accepted Answer

Many mitotic divisions occur before gamete formation, allowing for more mutations and potential beneficial traits

Question 16

Which of the following best explains the role of crossing over during meiosis?

Accepted Answer

It mixes maternal and paternal alleles at adjacent loci, increasing genetic diversity

Question 17

What is the evolutionary advantage of high fecundity (many offspring) in organisms?

Accepted Answer

It increases the potential for rapid diversification and survival of the lineage

Question 18

Which of the following is a real-world example of the importance of genetic diversification?

Accepted Answer

Genetically identical crops are more vulnerable to disease outbreaks than diverse populations

Question 19

Which process is responsible for the exponential increase in genetic diversity within a population over generations?

Accepted Answer

Sexual reproduction with independent assortment and recombination

Question 20

Which of the following statements about genetic linkage is correct?

Accepted Answer

Genes located on the same chromosome are more likely to be co-inherited

MBG 2400 The Major Engines of Genetic Diversification: Meiotic Recombination and Independent Assortment

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