Q: If the frequency of allele $$A_1 is 0.2 $$and the frequency of allele $$A_2 is 0.8 in a $$population at Hardy-Weinberg equilibrium, what is the expected frequency of heterozygotes ($$A_1A_2$$)?

$$2pq = 2 \times 0.2 \times 0.8 = 0.32$$

Question 1

Which of the following best describes a homeotic mutation in Drosophila?

Accepted Answer

A mutation that causes a segment to develop into the identity of another segment, such as legs growing where antennae should be.

Question 2

Which of the following is an example of a totipotent cell?

Accepted Answer

A fertilized egg (zygote) that can give rise to all cell types, including extraembryonic tissues.

Question 3

During Drosophila embryogenesis, what is the key difference between the syncytial blastoderm and the cellular blastoderm?

Accepted Answer

The syncytial blastoderm has multiple nuclei sharing a common cytoplasm, while the cellular blastoderm has individual cells separated by membranes.

Question 4

Which of the following best describes the function of bicoid protein in early Drosophila development?

Accepted Answer

It acts as a transcription factor that activates the expression of the gap gene hunchback in a concentration-dependent manner.

Question 5

In the context of population genetics, which equation correctly represents the Hardy-Weinberg equilibrium for a gene with two alleles, $$A_1$$ and $$A_2$$, with frequencies $$p$$ and $$q$$?

Accepted Answer

$$p^2 + 2pq$$ + $$q^2 = 1$

Question 6

If the frequency of allele $$A_1 is 0.2 $$and the frequency of allele $$A_2 is 0.8 in a $$population at Hardy-Weinberg equilibrium, what is the expected frequency of heterozygotes ($$A_1A_2$$)?

Accepted Answer

$$2pq = 2 	imes 0.2 	imes 0.8 = 0.32$$

Question 7

Which of the following is NOT a condition required for a population to remain in Hardy-Weinberg equilibrium?

Accepted Answer

High rates of mutation

Question 8

What is the evolutionary significance of the simultaneous knockout of all A-, B-, and C-class floral homeotic genes in plants?

Accepted Answer

It results in the formation of only leaf-like structures, suggesting that the ancestral flower was a leaf-like organ.

Question 9

Which of the following best describes the difference between the homeobox and the homeodomain?

Accepted Answer

The homeobox is a DNA sequence that encodes the homeodomain, which is a protein domain that binds DNA to regulate gene expression.

Question 10

In vertebrate animals, how many clusters of Hox genes are typically present, and what evolutionary process led to this number?

Accepted Answer

Four clusters, resulting from two rounds of whole-genome duplication.

Question 11

Which of the following best explains why bicoid and nanos are considered maternal effect genes?

Accepted Answer

Their mRNAs are deposited in the egg by the mother, and the phenotype of the offspring depends on the mother's genotype.

Question 12

Which of the following best describes the founder effect?

Accepted Answer

A small group of individuals establishes a new population, leading to reduced genetic variation compared to the original population.

Question 13

Which of the following statements about genetic drift and selection is correct?

Accepted Answer

Genetic drift has a stronger effect than selection in small populations.

Question 14

In the context of plant development, which tissue is responsible for indeterminate growth, and what type of cells does it contain?

Accepted Answer

Meristem tissue, which contains undifferentiated stem cells.

Question 15

Which of the following best describes the role of Bmps (Bone morphogenetic proteins) during hand and digit development in vertebrates?

Accepted Answer

Bmps regulate apoptosis between developing digits, shaping the final structure of the hand.

Question 16

Which of the following is a correct definition of 'evolution' in the context of population genetics?

Accepted Answer

A change in allele frequencies in a population over time.

Question 17

A population of 1000 individuals has 360 $$A_1A_1$$, 480 $$A_1A_2$$, and 160 $$A_2A_2$$ genotypes. What is the frequency of allele $$A_1$$?

Accepted Answer

$$p = \frac{2 	imes 360 + 480}{2 	imes 1000} = 0.6$$

Question 18

Which of the following best describes the concept of 'co-option' in evolutionary developmental biology (evo-devo)?

Accepted Answer

The recruitment of existing genes or gene networks for new developmental functions.

Question 19

Which of the following is a real-world example of how outbreeding can reduce offspring fitness?

Accepted Answer

Crossing individuals from two different populations may disrupt local adaptations, leading to outbreeding depression.

Question 20

Which of the following best describes the difference between census population size and effective population size?

Accepted Answer

Census size is the actual number of individuals, while effective size is the number of individuals contributing genes to the next generation.

Genetics Final Exam Study Guide: Developmental and Population Genetics

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