Hardy-Weinberg Equation

Mr. Anderson explains the Hardy-Weinberg equation, a tool for determining gene frequencies in a population. He defines key terms like phenotype and genotype, and uses examples to illustrate how alleles and dominance affect genetic traits. The video covers the concept of a gene pool and how to calculate allele frequencies. Mr. Anderson also provides a detailed walkthrough of the Hardy-Weinberg equation, emphasizing the importance of understanding phenotypes and genotypes in genetic problem-solving.

What is a phenotype?

• A section of DNA that codes for a trait

• The physical characteristics of an organism

• A type of allele

• The genetic makeup of an organism

Which of the following represents a genotype?

• Huntington's disease

• Red hair

• Carrier of cystic fibrosis

• Ability to taste PTC

What does it mean if a gene is recessive?

• It is always expressed in the phenotype

• It determines the phenotype alone

• It is hidden when a dominant gene is present

• It is more common in the population

In the sock analogy, what does a red sock represent?

• A dominant allele

• A recessive allele

• A phenotype

• A genotype

What is a gene pool?

• A collection of all genotypes in a population

• A collection of all phenotypes in a population

• A collection of all alleles in a population

• A collection of all dominant traits in a population

What does the frequency 'p' represent in the Hardy-Weinberg equation?

• Frequency of homozygous recessive individuals

• Frequency of dominant alleles

• Frequency of recessive alleles

• Frequency of heterozygous individuals

What does the term 'homozygous dominant' mean?

• Having two different alleles for a trait

• Having two recessive alleles for a trait

• Having one dominant and one recessive allele

• Having two dominant alleles for a trait

If 2% of a population has a recessive trait, what does this percentage represent in the Hardy-Weinberg equation?

• p squared

• q squared

• 2pq

• p + q

How do you calculate the frequency of heterozygous individuals using the Hardy-Weinberg equation?

• 2pq

• q squared

• p + q

• p squared

What is the first step in solving a Hardy-Weinberg problem?

• Identify the dominant allele

• Determine the p and q values

• Find the phenotype frequency

• Calculate the frequency of homozygous recessive individuals