Podcast
Questions and Answers
In population genetics, what is a locus?
In population genetics, what is a locus?
- A type of allele
- A genetic cross prediction tool
- A form of gene inheritance
- A specific physical location on a chromosome (correct)
How many possible alleles are there if a locus is a single nucleotide?
How many possible alleles are there if a locus is a single nucleotide?
- 5 possible alleles: A, T, C, G, T
- 2 possible alleles: A or B
- 3 possible alleles: X, Y, Z
- 4 possible alleles: A, T, C, or G (correct)
What did Mendel work with in his genetic experiments?
What did Mendel work with in his genetic experiments?
- Characters that are alphabetic (A/B/C/D)
- Characters that are binary (yellow/green, smooth/wrinkled, ...) (correct)
- Characters that are ternary (red/green/blue)
- Characters that are continuous (height, weight, ...)
Why did the law of independent assortment work for Mendel?
Why did the law of independent assortment work for Mendel?
What does the Hardy-Weinberg Equilibrium compare?
What does the Hardy-Weinberg Equilibrium compare?
In population genetics, what is the probability of two alleles being identical by descent?
In population genetics, what is the probability of two alleles being identical by descent?
Which of the following accurately describes the Hardy-Weinberg Equilibrium?
Which of the following accurately describes the Hardy-Weinberg Equilibrium?
What is the expected frequency of heterozygotes in the Hardy-Weinberg Equilibrium?
What is the expected frequency of heterozygotes in the Hardy-Weinberg Equilibrium?
What did Mendel work with in his genetic experiments?
What did Mendel work with in his genetic experiments?
What is a locus in the context of genetics?
What is a locus in the context of genetics?
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Study Notes
Locus and Alleles
- A locus is a specific location on a chromosome where a gene or a genetic marker is located
- If a locus is a single nucleotide, there are 4 possible alleles (A, C, G, and T)
Mendel's Genetic Experiments
- Mendel worked with pea plants ( Pisum sativum) in his genetic experiments
- He studied the inheritance of traits in pea plants to establish the laws of inheritance
Law of Independent Assortment
- The law of independent assortment worked for Mendel because he studied traits that were controlled by genes located on different chromosomes
- This allowed him to observe the independent segregation of alleles during gamete formation
Hardy-Weinberg Equilibrium
- The Hardy-Weinberg Equilibrium compares the genotype frequencies of a population at genetic equilibrium
- In the Hardy-Weinberg Equilibrium, the probability of two alleles being identical by descent is 0 (zero)
- The Hardy-Weinberg Equilibrium is a state in a population where the allele and genotype frequencies remain constant from one generation to the next
- The expected frequency of heterozygotes in the Hardy-Weinberg Equilibrium is 2pq, where p and q are the frequencies of the two alleles
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