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 separation of hereditary characters in heterozygote progeny.

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 correctly represents the number of different gametic types a diploid organism can produce, given n pairs of homologous chromosomes?

Accepted Answer

$$2^n$$

Question 5

A testcross is performed between a black dog (dominant phenotype, genotype unknown) and a chocolate dog (recessive phenotype). If all offspring are black, what is the genotype of the black dog?

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

Which of the following is NOT a characteristic Mendel studied in pea plants?

Accepted Answer

Leaf size

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 according to Mendel's 3:1 ratio?

Accepted Answer

75

Question 9

What is the formula for calculating the chi-square ($$X^2) $$value in a goodness-of-fit test?

Accepted Answer

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

Question 10

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

Accepted Answer

Trait appears in every generation and affected individuals always have an affected parent.

Question 11

If a pea plant with genotype PP (purple) is crossed with a plant with genotype pp (white), what will be the phenotype of the F1 generation?

Accepted Answer

All purple flowers

Question 12

Which of the following statements about Mendel's experiments is TRUE?

Accepted Answer

Mendel used pea plants with seven characteristics, each with two contrasting traits.

Question 13

What is the consequence of Mendel's principle of independent assortment?

Accepted Answer

Alleles of different genes segregate independently, forming all possible gamete combinations with equal probability.

Question 14

In a pedigree, an autosomal recessive trait is most likely indicated by:

Accepted Answer

Trait absent in some generations and affected individuals can have unaffected parents.

Question 15

If a heterozygous pea plant (Pp) is self-fertilized, what fraction of the offspring will be homozygous recessive?

Accepted Answer

$$\frac{1}{4}$$

Question 16

Which of the following is a real-world example of selective breeding?

Accepted Answer

Crossing pea plants to study flower color inheritance.

Question 17

In the Drosophila system, how are gene symbols assigned for recessive mutant phenotypes?

Accepted Answer

Lower case letters

Question 18

A scientist performs a chi-square test and obtains a P value of 0.03. What does this indicate?

Accepted Answer

There is a significant difference between observed and expected values; likelihood that difference is due to chance is less than 5%.

Question 19

Which of the following best explains why Mendel's results were reproducible and reliable?

Accepted Answer

He used a large sample size and counted his plants.

Mendelian Genetics: Principles of Heredity and Experimental Foundations

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