Question 1

Which of the following best describes the role of maternal effect genes in Drosophila development?

Accepted Answer

They are expressed in the mother and deposit mRNA/proteins into the egg to establish body axes before fertilization.

Question 2

A mutation in a Hox gene in Drosophila causes legs to develop where antennae should be. What does this illustrate about Hox gene function?

Accepted Answer

Hox genes determine the identity of each body segment along the anterior-posterior axis.

Question 3

Which equation best represents the central hierarchy of developmental control from gene to organism?

Accepted Answer

$$DNA \rightarrow RNA \rightarrow Proteins \rightarrow Cell specialization \rightarrow Tissue formation \rightarrow Organism development$$

Question 4

In the context of morphogen gradients, what would happen if the bicoid protein were uniformly distributed throughout a Drosophila embryo?

Accepted Answer

Anterior structures would form at both ends of the embryo.

Question 5

Which of the following is NOT a reason why model organisms like Drosophila melanogaster are used in developmental genetics research?

Accepted Answer

They are genetically identical to humans.

Question 6

A patient presents with limb malformations. Genetic analysis reveals a mutation in a Hox gene. Which process was most likely disrupted?

Accepted Answer

Segment identity specification during development.

Question 7

Which signaling pathway is most directly associated with neural tube defects due to folate pathway gene mutations?

Accepted Answer

Folate metabolic pathway

Question 8

Which gene group is responsible for subdividing the Drosophila embryo into large body regions, and what is a consequence of their mutation?

Accepted Answer

Gap genes; mutation eliminates large body segments.

Question 9

Which of the following best explains how cells with identical DNA become different during development?

Accepted Answer

Differential gene expression, spatial/temporal regulation, and cell signaling.

Question 10

A researcher observes that a Drosophila embryo lacks all head structures. Which gene is most likely mutated?

Accepted Answer

Bicoid

Question 11

Which process occurs first during stem cell differentiation?

Accepted Answer

Lineage commitment

Question 12

Which of the following is a correct sequence in the genetic hierarchy of Drosophila development?

Accepted Answer

Maternal effect genes $$\rightarrow$$ Gap genes $$\rightarrow$$ Pair-rule genes $$\rightarrow$$ Segment polarity genes $$\rightarrow$$ Homeotic genes

Question 13

Which of the following developmental disorders is most directly linked to a mutation in the Sonic hedgehog (SHH) gene?

Accepted Answer

Holoprosencephaly

Question 14

Which statement best describes the concept of determination in developmental genetics?

Accepted Answer

A cell commits to a specific developmental fate before differentiation.

Question 15

Which of the following is a function of enhancers in gene regulation during development?

Accepted Answer

They promote spatial and temporal gene expression by increasing transcription.

Question 16

If a mutation disrupts the Hedgehog signaling pathway during embryonic development, which process is most likely affected?

Accepted Answer

Notochord induction and somite formation

Question 17

Which equation best describes the relationship between morphogen concentration and cell fate?

Accepted Answer

$$	ext{High concentration} ightarrow 	ext{Cell fate A}$$, $$	ext{Medium concentration} ightarrow 	ext{Cell fate B}$$, $$	ext{Low concentration} ightarrow 	ext{Cell fate C}$$

Question 18

Which gene mutation is most likely to result in achondroplasia, a disorder affecting bone growth?

Accepted Answer

FGFR3 gene mutation

Question 19

Which of the following is a post-transcriptional regulatory mechanism in developmental genetics?

Accepted Answer

Alternative splicing of mRNA

Question 20

A Drosophila embryo shows loss of every other segment. Which gene group is most likely mutated?

Accepted Answer

Pair-rule genes

Developmental Genetics: Mechanisms of Growth, Differentiation, and Pattern Formation

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