Question 1

Which of the following best explains why differentiated plant cells can be used to clone an entire plant?

Accepted Answer

Differentiated plant cells retain all the genetic information necessary to produce any cell type.

Question 2

In the context of epigenetics, what is the effect of DNA methylation on gene expression?

Accepted Answer

It causes chromatin to condense, turning genes 'off'.

Question 3

Which of the following is a real-world example of environmental influence on epigenetics, as seen in the Agouti mice?

Accepted Answer

Exposure to Bisphenol A can prevent methylation of the agouti gene, leading to yellow, obese mice.

Question 4

Which process is most important for regulating gene expression during development in eukaryotes?

Accepted Answer

Transcriptional control by regulatory transcription factors

Question 5

During animal development, which process is responsible for the rearrangement of cells into three layers?

Accepted Answer

Gastrulation

Question 6

Which of the following best describes the role of morphogens in embryonic development?

Accepted Answer

They form concentration gradients that provide spatial information to cells.

Question 7

Suppose the bicoid protein is injected into the posterior end of a Drosophila embryo. What is the most likely outcome?

Accepted Answer

Anterior structures would form in more posterior regions.

Question 8

Which of the following is NOT a shared developmental process in multicellular organisms?

Accepted Answer

All cells undergo meiosis to produce gametes.

Question 9

What is the main difference between cytoplasmic determinants and induction in specifying cell fate?

Accepted Answer

Cytoplasmic determinants are unequally distributed molecules, while induction involves signaling from neighboring cells.

Question 10

Which of the following best explains why Dolly the sheep was genetically identical to the donor sheep?

Accepted Answer

The nucleus from the donor sheep was transferred into an enucleated egg, demonstrating genetic equivalence.

Question 11

Which of the following is a correct sequence in the genetic regulatory cascade during Drosophila development?

Accepted Answer

Morphogens → Gap genes → Pair-rule genes → Segment polarity genes → Hox genes → Effector genes

Question 12

Which of the following statements about stem cells is TRUE?

Accepted Answer

In plants, stem cells are called meristems and are present throughout the plant's life.

Question 13

Which experimental technique is used to determine the location of specific mRNAs in an embryo?

Accepted Answer

Fluorescent in situ hybridization (FISH)

Question 14

If a mutation caused all cells in a Drosophila embryo to express high levels of bicoid protein, what would be the most likely developmental outcome?

Accepted Answer

The embryo would show no development of posterior regions.

Question 15

Which of the following best describes the function of Hox genes in development?

Accepted Answer

They specify the identity of each segment and the adult structures that will develop.

Question 16

Which of the following equations best represents the relationship between morphogen concentration and gene activation in a simplified model?

Accepted Answer

$$ G(x) = \begin{cases} 1, & M(x) \u003e T \ 0, & M(x) \leq T \end{cases} $$

Question 17

Which of the following is an example of programmed cell death during development?

Accepted Answer

Apoptosis of cells that form webbing between human toes

Question 18

In plants, which molecule acts as a morphogen to provide positional information during development?

Accepted Answer

Auxin

Question 19

Which of the following best explains why cells in different locations of an embryo develop into different tissues?

Accepted Answer

They receive different concentrations of morphogens, leading to differential gene expression.

Genes, Development, and Evolution: Key Concepts in Genetic Control of Development

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