Question 1

Which experimental evidence best supports the concept of genetic equivalence in multicellular organisms?

Accepted Answer

The ability to clone mammals from differentiated cells, as shown in the process of cloning a sheep.

Question 2

In the process of cell differentiation, what is the primary mechanism that allows cells to acquire specialized properties?

Accepted Answer

Differential gene expression, where only a subset of genes are expressed in each cell.

Question 3

Which of the following best describes the role of genetic regulatory cascades in development?

Accepted Answer

They provide increasingly specific positional information to cells, guiding their fate.

Question 4

A fruit fly embryo develops legs in place of antennae due to a mutation in which type of gene?

Accepted Answer

Homeotic (Hox) gene

Question 5

Which equation represents the probability of gene duplication due to unequal crossing over during meiosis?

Accepted Answer

$$P = \frac{n_{dup}}{n_{total}}$$

Question 6

Which gene family is responsible for oxygen transport and shows differential expression during development?

Accepted Answer

Globin gene family

Question 7

What is the significance of Hox gene conservation across species?

Accepted Answer

It suggests that Hox genes are homologous and arose early in animal evolution.

Question 8

Which developmental gene is responsible for organizing cells into broad regions along the anterior–posterior axis?

Accepted Answer

Gap gene

Question 9

If a mutation causes Hoxc6 and Hoxc8 to be expressed together throughout the trunk of an embryo, what morphological outcome is most likely?

Accepted Answer

Loss of forelimbs, as seen in snakes.

Question 10

Which equation best describes the relationship between gene family size and gene duplication events?

Accepted Answer

$$N_{family} = N_{original} + N_{duplications}$$

Question 11

Which gene initiates eye development in both vertebrates and invertebrates, despite differences in eye structure?

Accepted Answer

PAX gene

Question 12

What is the primary evolutionary advantage of gene duplication?

Accepted Answer

It allows new gene copies to acquire novel functions through mutation.

Question 13

Which of the following is NOT a function of effector genes in development?

Accepted Answer

Establishing the anterior–posterior axis

Question 14

Which equation represents the affinity of fetal hemoglobin for oxygen compared to adult hemoglobin?

Accepted Answer

$$K_{fetal} \u003e K_{adult}$$

Question 15

Which statement best explains how simple genetic changes can lead to complex morphological outcomes?

Accepted Answer

Mutations in regulatory genes can alter the expression of many downstream genes, resulting in major changes in body structure.

Question 16

Which of the following is a plausible consequence of gene duplication within a gene family?

Accepted Answer

Formation of pseudogenes that may evolve new functions.

Question 17

Which developmental gene is expressed in alternating bands and controls the formation of individual segments in fruit fly embryos?

Accepted Answer

Pair-rule gene

Question 18

Which equation describes the relationship between the number of exons ($$E) $$and introns ($$I) in $$globin genes?

Accepted Answer

$$E = I + 1$$

Question 19

How does the concept of 'arrival of the fittest' in Evo-Devo differ from 'survival of the fittest' in classical evolutionary theory?

Accepted Answer

'Arrival of the fittest' emphasizes the generation of novel forms through developmental genetic changes, while 'survival of the fittest' focuses on selection among existing forms.

Question 20

Which of the following best describes the colinearity of Hox genes on chromosomes?

Accepted Answer

Hox genes are arranged in the same order on the chromosome as their expression domains along the body axis.

Genes, Development, and Evolution: Evo-Devo Principles and Mechanisms

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