Question 1

Which of the following best describes Mendel's principle of segregation?

Accepted Answer

Alleles that carry hereditary information segregate during gamete formation, resulting in each gamete containing only one allele for each gene.

Question 2

In Mendel's monohybrid cross with pea plants, what was the observed phenotypic ratio in the F2 generation?

Accepted Answer

3:1

Question 3

A pea plant with genotype Pp is crossed with another Pp plant. What is the expected genotypic ratio in the F2 generation?

Accepted Answer

$$1\ PP : 2\ Pp : 1\ pp$$

Question 4

Which equation is used to calculate the chi-square value in a goodness-of-fit test?

Accepted Answer

$$X^2$$ = \sum \frac{(O - $$E)^2$$}{E}$$

Question 5

If a black puppy (B–) is crossed with a chocolate puppy (bb), and half the offspring are black and half are chocolate, what is the genotype of the black puppy?

Accepted Answer

Bb

Question 6

In a dihybrid cross between two heterozygous pea plants (YyRr × YyRr), what is the expected phenotypic ratio in the F2 generation?

Accepted Answer

9:3:3:1

Question 7

What is the mechanism underlying Mendel's principle of independent assortment?

Accepted Answer

Independent assortment of chromosome pairs during gamete formation

Question 8

A scientist observes 69 purple and 31 white flowers in a sample of 100 pea plants. What is the expected number of purple flowers if the ratio is 3:1?

Accepted Answer

$$75$$

Question 9

Which of the following is NOT a complication in studying Mendelian genetics in humans?

Accepted Answer

True-breeding lines are easily established

Question 10

In a pedigree, which pattern suggests an autosomal dominant trait?

Accepted Answer

Affected individuals appear in every generation

Question 11

If a plant geneticist uses the 'Mendelian system' for genetic symbols, which symbol would represent the dominant purple allele in peas?

Accepted Answer

P

Question 12

What is the number of different gametic types a diploid organism can produce, given $$n$$ pairs of homologous chromosomes?

Accepted Answer

$$2^n$$

Question 13

Which of the following best explains why traits do not blend in Mendel's experiments?

Accepted Answer

Each parent contributes only one allele, and dominant alleles mask recessive alleles.

Question 14

In a testcross, a dominant phenotype is crossed with a recessive phenotype. If all offspring display the dominant phenotype, what is the genotype of the dominant parent?

Accepted Answer

Homozygous dominant

Question 15

Which of the following is an example of an autosomal recessive trait in humans?

Accepted Answer

Cystic fibrosis

Question 16

What is the degree of freedom (df) for a chi-square test with two expected phenotypes?

Accepted Answer

$$df = n - 1 = 2 - 1 = 1$$

Question 17

If the probability $$P$$ from a chi-square test is greater than or equal to $$0.05$$, what does this indicate?

Accepted Answer

The difference between observed and expected values is likely due to chance.

Question 18

In Mendel's experiments, what was the lag time for phenotypic consequences of segregation?

Accepted Answer

One generation

Question 19

Which of the following statements about Mendel's principle of independent assortment is correct?

Accepted Answer

Alleles for different genes assort into gametes independently, resulting in all possible gamete combinations formed with equal probability.

Question 20

In a pedigree, how can you distinguish between autosomal dominant and autosomal recessive traits?

Accepted Answer

Autosomal dominant traits appear in every generation, while autosomal recessive traits may skip generations.

Mendelian Genetics: Principles of Heredity and Experimental Foundations

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