Q: In the central dogma of molecular biology, what is the correct sequence of information flow?

$$\text{DNA} \rightarrow \text{RNA} \rightarrow \text{Protein}$$

Q: If the frequency of the dominant allele in a population is $$p = 0.7$$, what is the expected frequency of heterozygotes under Hardy-Weinberg equilibrium?

$$2pq = 2 \times 0.7 \times 0.3 = 0.42$$

Question 1

Which of the following best describes the difference between haploid and diploid cells, as shown in the first image?

Accepted Answer

Haploid cells have one copy of each chromosome, while diploid cells have two copies.

Question 2

During meiosis, crossing over occurs in which phase, and what is its evolutionary significance?

Accepted Answer

Crossing over occurs during prophase I and increases genetic variation.

Question 3

Referencing the male reproductive system diagram, which structure is responsible for the maturation and storage of sperm?

Accepted Answer

Epididymis

Question 4

Which hormone triggers ovulation and the release of a mature egg from the ovary, as shown in the ovarian cycle diagram?

Accepted Answer

LH (Luteinizing Hormone)

Question 5

In the central dogma of molecular biology, what is the correct sequence of information flow?

Accepted Answer

$$	ext{DNA} ightarrow 	ext{RNA} ightarrow 	ext{Protein}$$

Question 6

A population of beetles experiences a bottleneck event, as shown in the diagram. What is the most likely genetic consequence?

Accepted Answer

Decreased genetic diversity due to random loss of alleles.

Question 7

Which evolutionary process is illustrated when a small group of butterflies colonizes a new island and develops different traits from the ancestral population?

Accepted Answer

Founder effect

Question 8

Which type of natural selection is depicted when intermediate phenotypes are favored over extremes, as shown in the selection diagram?

Accepted Answer

Stabilizing selection

Question 9

The similarity in bone structure between a human arm, a cat leg, a whale flipper, and a bat wing is an example of:

Accepted Answer

Homologous structures

Question 10

Which pattern of speciation is characterized by long periods of little change interrupted by brief periods of rapid change, as shown in the butterfly diagram?

Accepted Answer

Punctuated equilibrium

Question 11

A survivorship curve that shows high survival rates for the young and most of adulthood, followed by a rapid decline in survival in old age, is characteristic of which type?

Accepted Answer

Type I

Question 12

Given the logistic growth equation $$G = rN \left( \frac{K-N}{K} \right)$$, what happens to the population growth rate as $$N$$ approaches $$K$$?

Accepted Answer

Growth rate slows and approaches zero.

Question 13

During demographic transition, which stage is characterized by the largest gap between birth and death rates, leading to rapid population growth?

Accepted Answer

Developing

Question 14

Which of the following best describes the role of a keystone species in an ecosystem?

Accepted Answer

A species that has a disproportionately large impact on community structure.

Question 15

In the carbon cycle diagram, which process is primarily responsible for removing carbon dioxide from the atmosphere?

Accepted Answer

Photosynthesis

Question 16

Which of the following is a density-dependent factor that regulates population size?

Accepted Answer

Disease

Question 17

Which of the following best explains why invasive species often reduce biodiversity in an ecosystem?

Accepted Answer

They outcompete native species for resources, leading to population declines.

Question 18

Which of the following is the ultimate source of genetic variation in a population?

Accepted Answer

Mutations

Question 19

Which of the following is a postzygotic reproductive barrier?

Accepted Answer

Reduced hybrid fertility

Question 20

If the frequency of the dominant allele in a population is $$p = 0.7$$, what is the expected frequency of heterozygotes under Hardy-Weinberg equilibrium?

Accepted Answer

$$2pq = 2 	imes 0.7 	imes 0.3 = 0.42$$

Comprehensive Study Notes: Genetics, Evolution, Reproduction, and Ecology

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