Understanding Allele Frequency

The video explores allele frequency, using eye color as a model to explain genetic concepts. It discusses dominant and recessive alleles, and how to calculate allele frequencies in a population. The video differentiates between phenotype and allele frequency, and introduces the Hardy-Weinberg principle, emphasizing the importance of understanding these concepts for genetic studies.

What is an allele?

• A variant of a gene

• A type of cell

• A chromosome

• A type of protein

In the simplified eye color model, which allele is dominant?

• Neither is dominant

• Both are dominant

• Capital B

• Lowercase b

What is the genotype of a person with blue eyes in this model?

• bB

• bb

• Bb

• BB

How many alleles are present in the small population model?

• Four

• Three

• Two

• Five

What is the frequency of the brown allele in the small population model?

• 50%

• 25%

• 75%

• 100%

How does allele frequency differ from phenotype frequency?

• Allele frequency is always higher than phenotype frequency.

• Allele frequency considers individual alleles, while phenotype frequency considers visible traits.

• They are the same.

• Phenotype frequency considers individual alleles, while allele frequency considers visible traits.

What percentage of the population has brown eyes in the small model?

• 75%

• 50%

• 100%

• 25%

What does the letter P represent in the Hardy-Weinberg principle?

• Frequency of the dominant allele

• Frequency of the recessive allele

• Phenotype frequency

• Total population

What is the sum of P and Q in the Hardy-Weinberg principle?

• 2

• 1

• 100

• 0.5

What does the Hardy-Weinberg principle help us understand?

• The relationship between genotype and phenotype

• The stability of allele frequencies in a population

• The inheritance of a single trait

• The mutation rate of alleles