Question 1

Which of the following best describes Mendel’s Law of Segregation?

Accepted Answer

Alleles for a trait separate during gamete formation, so each gamete carries only one allele for each trait.

Question 2

In Mendel’s pea plant experiments, what was the observed phenotypic ratio in the F2 generation when crossing two heterozygotes for flower color?

Accepted Answer

$$3:1$$

Question 3

Which scenario best illustrates codominance?

Accepted Answer

A heterozygous individual expresses both alleles equally, such as AB blood type displaying both A and B antigens.

Question 4

If a plant with genotype $$RR ($$red flowers) is crossed with a plant with genotype $$rr ($$white flowers), and all F1 offspring have pink flowers, what type of dominance is this?

Accepted Answer

Incomplete dominance

Question 5

Which of the following is an example of variable expressivity?

Accepted Answer

Individuals with the same mutant genotype show a range of phenotypes.

Question 6

A person with the genotype $$I^A I^B$$ for the ABO blood group will have which blood type?

Accepted Answer

Type AB

Question 7

Which statement about incomplete penetrance is correct?

Accepted Answer

Some individuals with the mutant genotype do not express the mutant phenotype.

Question 8

If two heterozygous tall pea plants ($$Tt) $$are crossed, what is the expected genotypic ratio in the offspring?

Accepted Answer

$$1:2:1 (TT$$:Tt:tt)

Question 9

Which of the following best explains the phrase 'like begets like' in genetics?

Accepted Answer

Traits are passed from parents to offspring through heritable factors.

Question 10

A family has a history of polydactyly, but not all individuals with the mutant allele show extra fingers. This is an example of:

Accepted Answer

Incomplete penetrance

Question 11

Which of the following is NOT a feature of Mendelian inheritance?

Accepted Answer

Phenotypes are always determined by environmental factors.

Question 12

In a cross between two plants with genotypes $$Rr ($$where $$R is $$dominant for red flowers and $$r is $$recessive for white), what percentage of the offspring are expected to have red flowers?

Accepted Answer

$$75\%$$

Question 13

Which of the following best describes the difference between codominance and incomplete dominance?

Accepted Answer

Codominance results in both alleles being fully expressed, while incomplete dominance results in an intermediate phenotype.

Question 14

A cross between two heterozygous individuals for a trait with incomplete dominance ($$Rr) $$produces offspring with the following phenotypes: red, pink, and white. What is the expected phenotypic ratio?

Accepted Answer

$$1:2:1 ($$Red:Pink:White)

Question 15

Which genotype would result in a person having type O blood?

Accepted Answer

$$ii$$

Question 16

If a trait shows incomplete penetrance, which of the following is true?

Accepted Answer

Some individuals with the genotype do not express the phenotype.

Question 17

Which of the following is a real-world example of codominance?

Accepted Answer

AB blood type in humans, where both A and B antigens are present.

Question 18

Which of the following best explains why Mendel’s work was significant for genetics?

Accepted Answer

He established that traits are inherited as discrete units (genes) and formulated laws describing their transmission.

Question 19

A child inherits the genotype $$I^A i$$ for the ABO blood group. What is their blood type?

Accepted Answer

Type A

Mendelian Genetics and Concepts of Dominance

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