Origins of Genetic Variation Practice Formative - Kate Turner | Laabri

1

Which of the following are examples of genetic variation? Select all that apply

Mutations

Crossing over

Random fertilization

Independent assortment

1

During what process (not phase) do mutations occur? This should be a two word answer.

1

Independent assortment is the random alignment of ____________ during metaphase 1.

1

Which of the following are more likely arrangements of chromosomes during metaphase 1?

A

B

They are equally likely

1

Crossing over involves the genetic exchange of information between _______ during prophase 1 inside a tetrad.

1

What is independent assortment during meiosis primarily responsible for?

Random combination of gametes during fertilization

Genetic variation in gametes

Increasing chromosome number

Uniform gamete characteristics

1

During crossing over, what occurs between the sister chromatids?

Separation of homologous pairs

Replication of DNA segments

Alignment along the equator

Exchange of genetic material

1

How does random fertilization contribute to genetic diversity?

Prevents genetic variation entirely

Ensures identical offspring creation

Selects the dominant sperm only

Combines unique gametes from two biological parents

1

Which stage of meiosis does independent assortment occur?

Telophase II

Anaphase I

Prophase II

Metaphase I

1

What effect does crossing over have on offspring?

Copies DNA without change

Creates identical offspring traits

Increases genetic diversity

Reduces mutation rates

1

What is a mutation?

A change in the DNA sequence.

A gene transfer between species.

A form of genetic isolation.

An adaptive response to the environment.

1

How do mutations contribute to evolution?

They eliminate genetic variation entirely.

They are always harmful to the organism.

They only affect physical traits.

They create new traits for natural selection.

1

Which type of mutation is most likely to have no effect?

A missense mutation

A nonsense mutation

A silent mutation

A deletion mutation causing a frameshift.

1

Which type of mutation is most likely to lead to a smaller protein size?

A missense mutation

A nonsense mutation

A silent mutation

A deletion mutation causing a frameshift.

1

Which can increase the likelihood of mutations?

Environmental factors like radiation or chemicals.

Lack of genetic variation in a population.

Natural selection eliminating weak traits.

The presence of identical twins.