Biology

Genetics and Evolutionary Biology

1,156 Questions

Genetics and evolutionary biology explain how traits are passed from parents to offspring and how species change over time. Key concepts include genetic drift, inbreeding, and heredity. This topic is fundamental for the biology section of many competitive tests.

Heredity and traitsGenetic variations and driftInbreeding conceptsEvolutionary mechanisms

Genetics and Evolutionary Biology Questions

Multiple choice

What is the survival of the fittest, acts on individuals called?

  1. Natural Selection

  2. Artificial Selection

  3. Lazy Selection

  4. Homozygous
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Natural selection is the process where individuals with traits better suited to their environment are more likely to survive and reproduce. This is the core mechanism of evolutionary change.

Multiple choice

What is heredity?

  1. The passing on of traits from parent to offspring

  2. The scientific term for asexual reproduction
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Heredity is the biological process by which genetic traits are passed from parents to their offspring through reproduction.

Multiple choice

Blue eyes _____

  1. Are a mutation

  2. Didn't exist at one point

  3. Some from a single common ancestor

  4. All of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Scientific research suggests that blue eyes are the result of a genetic mutation that occurred in a single common ancestor, and they did not exist in humans prior to that point.

Multiple choice

The most important reason that one can see evolution in a population of mosquitoes more easily than one can in us is

  1. have a higher mutation rate

  2. are exposed to toxic chemicals

  3. have a shorter life cycle

  4. lay eggs rather than bearing live offspring
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The primary reason evolution is observed more quickly in mosquitoes than in humans is their short life cycle, which allows for many generations to pass in a short amount of time.

Multiple choice

What would happen if a mutation created a new allele that decreased fitness?

  1. The new allele would have to change back to an allele of higher fitness

  2. the indv with the new allele would wait for an env change to inc its fitnes

  3. new allele would decrease the fitness & offspring # of the person having it

  4. new allele will spread through the population&decrease fitness of whole pop
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Fitness is defined by the ability to survive and reproduce. A mutation that decreases fitness will naturally reduce the individual's survival or reproductive success, leading to fewer offspring.

Multiple choice

Which of the following is true of individuals who are well adapted for a particular environment?

  1. They are at a disadvantage in other environments

  2. They are the best fit for all other environments

  3. They will mutate to become fit in other environments

  4. They may or may not be equally fit in another environment

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Adaptations are specific to the environment in which they evolved. An organism that is highly fit in one environment may not possess the traits necessary to survive or thrive in a different, contrasting environment.

Multiple choice

The primary source for new, unique genes in a population is

  1. mutation

  2. artificial selection

  3. crossing-over

  4. natural selection
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Mutations are random changes in the DNA sequence. They are the ultimate source of new genetic variation in a population, providing the raw material upon which natural selection acts.

Multiple choice botany chromosomal basis of inheritance linkage and crossing over linkage and recombination genetics: inheritance

The presence of continuous phenotypic variation in an $F _2$-generation suggests that a character is inherited by?

  1. Gene linkage

  2. Epistasis

  3. Polygenic inheritance

  4. Recombination
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Continuous phenotypic variation, where traits show a smooth gradient of phenotypes like height or skin color, is typically controlled by multiple genes working together, known as polygenic inheritance.

Multiple choice biology inherited changes linkage and crossing over linkage and recombination genetics: inheritance

The primary biological importance of sex in organisms is that it

  1. Is essential for organismic reproduction

  2. Is essential for cellular reproduction

  3. Causes new mutations to occur in offspring

  4. Promotes genetic variability in offspring
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The primary biological advantage of sexual reproduction over asexual reproduction is the generation of genetic diversity through recombination and independent assortment, which aids in adaptation.

Multiple choice zoology meaning of life level of biological organization in animals introduction to tissues basics of ecology

Plant species having a wide range of genetical distribution evolve into a local population known as

  1. Ecotype

  2. Biome

  3. Ecosystem

  4. Population
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The different populations of the same organism present in particular geographical areas are called as local populations or demes. A local population adapted genetically to its particular environment is called as ecotype. There may be several ecotypes of the same organism, which show variations amongst them.

Multiple choice zoology meaning of life level of biological organization in animals introduction to tissues basics of ecology

Plant species having a wide range of genetical distribution evolve into a local population known as

  1. Ecotype

  2. Blame

  3. Ecosystem

  4. Population

  5. Ephemerals
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

An ecotype is a genetically distinct geographic variety, population, or race within a species, which is genotypically adapted to specific environmental conditions.