Q: Which of the following is an example of the product rule in probability?

The probability of rolling two 1s with two dice is $1/6 \times 1/6 = 1/36$.

Question 1

Which of the following best describes the Law of Segregation as proposed by Mendel?

Accepted Answer

Each gamete receives only one allele from each gene pair, so offspring inherit one allele from each parent.

Question 2

A test cross is performed between a pea plant with round seeds (dominant phenotype) and a plant with wrinkled seeds (recessive phenotype). If the round-seeded plant is heterozygous, what is the expected phenotypic ratio among the offspring?

Accepted Answer

1:1 round to wrinkled

Question 3

Which of the following statements about the Law of Independent Assortment is correct?

Accepted Answer

It states that the segregation of one gene pair is independent of the segregation of another gene pair, except when genes are on the same chromosome.

Question 4

In a dihybrid cross between two heterozygous pea plants (AaBb x AaBb), what is the expected phenotypic ratio among the F2 offspring, assuming independent assortment?

Accepted Answer

$9:3:3:1$

Question 5

A woman is heterozygous for brown eyes ($Br/bl$), and her husband has blue eyes ($bl/bl$). Brown is dominant to blue. What is the probability that their child will have blue eyes?

Accepted Answer

$1/2$

Question 6

If the same couple from the previous question has two children, what is the probability that both children will have blue eyes?

Accepted Answer

$1/4$

Question 7

Which of the following best defines a gene?

Accepted Answer

The basic unit of inheritance that encodes information for a trait.

Question 8

What is the main difference between forward genetics and reverse genetics?

Accepted Answer

Forward genetics starts with a phenotype and identifies the gene responsible; reverse genetics starts with a gene and investigates the resulting phenotype.

Question 9

A geneticist is analyzing the results of a cross and wants to determine if the observed data fit the expected Mendelian ratio. Which statistical test should they use?

Accepted Answer

Chi-square ($\chi^2$) test

Question 10

Given the following observed and expected values from a genetic cross: Observed = 105 yellow, 95 green; Expected = 100 yellow, 100 green. What is the value of $\chi^2$ for this data?

Accepted Answer

$0.5$

Question 11

Which of the following best describes a pure-breeding (true-breeding) strain?

Accepted Answer

A strain that consistently produces offspring with the same phenotype when self-fertilized.

Question 12

In a chi-square ($\chi^2$) test, what does a p-value greater than $0.05$ indicate about your hypothesis?

Accepted Answer

The observed data are consistent with the hypothesis; any deviation is likely due to chance.

Question 13

Which of the following is the correct formula for the chi-square ($\chi^2$) statistic?

Accepted Answer

$\chi^2 = \sum \frac{(Observed - Expected)^2}{Expected}$

Question 14

A genetic cross yields 5474 round and 1850 wrinkled seeds. The expected ratio is 3:1. What is the expected number of round seeds if the total number of seeds is 7324?

Accepted Answer

$5493$

Question 15

Which of the following best defines an allele?

Accepted Answer

A form of a gene that exists at a single locus.

Question 16

If you cross two heterozygous individuals ($Aa$ x $Aa$), what is the expected genotypic ratio among the offspring?

Accepted Answer

$1:2:1$ (AA:Aa:aa)

Question 17

Which of the following is an example of the product rule in probability?

Accepted Answer

The probability of rolling two 1s with two dice is $1/6 	imes 1/6 = 1/36$.

Question 18

Which of the following is NOT a step in a forward genetics approach?

Accepted Answer

Start with a gene sequence and create a mutation.

Question 19

A researcher performs a reciprocal cross between pure-breeding parents for a trait. What result should they expect if the trait is autosomal and follows Mendelian inheritance?

Accepted Answer

The results will be identical regardless of which parent provides the dominant or recessive allele.

Question 20

Which of the following best describes the difference between genotype and phenotype?

Accepted Answer

Genotype is the allelic composition of an organism, while phenotype is the observable characteristic.

Introduction to Genetics: Key Concepts and Mendelian Principles

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