Unit 11 Allele Frequency Checkpoint

What is allele frequency?

• The number of organisms in a population

• The percentage of an allele in a population

• The number of alleles an organism has

• The genetic diversity of a species

Answer explanation

Allele frequency refers to the percentage of a specific allele within a population's gene pool. It quantifies how common an allele is compared to others, making the second choice the correct answer.

Tags

NGSS.HS-LS4-3

How is allele frequency expressed?

• As a total number of organisms like 150 alleles

• As a genetic sequence like ATCGATT

• As a percentage like 65%

• As the number of alleles in the population like 200 alleles

Answer explanation

Allele frequency is expressed as a percentage, indicating the proportion of a specific allele relative to the total number of alleles in the population. Thus, '65%' is the correct representation.

In a population, if the total number of alleles is 100, and 30 of those alleles are A, what is the allele frequency of allele A?

• 30%

• 70%

• 15%

• 60%

Answer explanation

To find the allele frequency of allele A, divide the number of A alleles (30) by the total number of alleles (100). This gives 30/100 = 0.30, or 30%. Thus, the correct answer is 30%.

Tags

NGSS.HS-LS3-3

In a population, if the total number of alleles is 100, and 30 of those alleles are A, what is the allele frequency of allele a?

• 30%

• 70%

• 15%

• 60%

Answer explanation

To find the frequency of allele a, subtract the number of A alleles from the total alleles. There are 100 total alleles and 30 are A, so 100 - 30 = 70 alleles are a. The frequency of a is 70/100 = 70%.

Tags

NGSS.HS-LS3-3

If a population of 100 organisms has 200 alleles in total, and allele B appears 120 times, what is the allele frequency of allele B?

• 60%

• 120%

• 320%

• 12%

Answer explanation

To find the allele frequency of allele B, divide the number of times allele B appears (120) by the total number of alleles (200). This gives 120/200 = 0.6, or 60%. Thus, the correct answer is 60%.

Tags

NGSS.HS-LS3-3

A population of 50 rabbits has how many total alleles for a single trait?

• 50

• 100

• 25

• 200

Answer explanation

Each rabbit has 2 alleles for a single trait (one from each parent). Therefore, for 50 rabbits, the total number of alleles is 50 rabbits x 2 alleles = 100 alleles. Thus, the correct answer is 100.

Tags

NGSS.HS-LS3-3

If allele frequency changes in a population over time, what does this suggest?

• The population is stable and unchanging

• The population's habitat might have changed

• There is no genetic variation in the population

• The population has stopped reproducing

Answer explanation

If allele frequency changes, it indicates that the population is adapting to new environmental conditions, suggesting that the population's habitat might have changed.

Tags

NGSS.HS-LS4-2

NGSS.HS-LS4-4

NGSS.HS-LS4-5

What happens when an allele's frequency increases in a population?

• The allele is becoming less common in the population

• The population is becoming genetically identical

• The trait associated with the allele is more likely to be passed on to future generations

• The allele is being replaced by another allele

Answer explanation

When an allele's frequency increases, it indicates that the trait associated with that allele is becoming more common, making it more likely to be passed on to future generations.

Tags

NGSS.HS-LS4-2

NGSS.HS-LS4-4

NGSS.HS-LS4-5

In a population of 100 birds, the total number of alleles is 200. If allele A appears 60 times, what is the allele frequency of allele A?

Mathematical Equivalence

ON

Tags

NGSS.HS-LS3-3

In a population of 50 birds, the total number of alleles is 100. If allele A appears 90 times, what is the allele frequency of allele A?

Mathematical Equivalence

ON

Tags

NGSS.HS-LS2-2

NGSS.HS-LS3-3