Question 1

Which of the following best explains why Mendel chose pea plants for his genetic experiments?

Accepted Answer

Pea plants have a short life cycle and produce many offspring, allowing for rapid and large-scale experiments.

Question 2

Which hypothesis did Mendel's experiments disprove regarding inheritance?

Accepted Answer

Blending inheritance, which suggested offspring are a mix of parental traits.

Question 3

In Mendel's monohybrid cross between purebred purple (PP) and white (pp) pea plants, what was the genotype of the F1 generation?

Accepted Answer

All F1 plants were heterozygous ($$Pp).$$

Question 4

What is the phenotypic ratio expected in the F2 generation of a monohybrid cross between two heterozygous pea plants ($$Pp 	imes Pp$$)?

Accepted Answer

3:1 (three purple, one white)

Question 5

Which term describes an individual with two identical alleles for a gene?

Accepted Answer

Homozygous

Question 6

If a pea plant has the genotype $$Pp$$, what is its phenotype?

Accepted Answer

Purple flowers

Question 7

Which principle states that alleles for a gene separate during gamete formation?

Accepted Answer

Principle of Segregation

Question 8

A dihybrid cross ($$YyRr 	imes YyRr) $$produces offspring with which phenotypic ratio?

Accepted Answer

9:3:3:1

Question 9

Which principle explains why genes for seed shape and seed color assort independently during meiosis?

Accepted Answer

Principle of Independent Assortment

Question 10

What is the expected phenotypic ratio in a testcross of a dihybrid ($$YyRr 	imes yyrr$$)?

Accepted Answer

1:1:1:1

Question 11

How does linkage affect inheritance patterns?

Accepted Answer

Linked genes are inherited together because they are located on the same chromosome.

Question 12

Which genotype(s) would produce type AB blood in humans?

Accepted Answer

$$I^A I^B$$

Question 13

Which inheritance pattern results in a heterozygote expressing both alleles equally, such as in AB blood type?

Accepted Answer

Codominance

Question 14

A cross between a red flower ($$RR) $$and a white flower ($$rr) $$produces pink flowers ($$Rr). $$What type of inheritance is this?

Accepted Answer

Incomplete dominance

Question 15

Which of the following best describes pleiotropy?

Accepted Answer

A single gene affects multiple traits.

Question 16

How can environmental influences affect phenotype?

Accepted Answer

Environmental factors can modify the expression of genes, resulting in different phenotypes.

Question 17

According to Nilsson-Ehles’s model of quantitative inheritance, what distribution is expected for traits like height or color intensity?

Accepted Answer

A normal (bell-shaped) distribution

Question 18

In a pedigree showing freckles (F) versus no freckles (f), which mode of transmission is most likely if the trait appears equally in males and females and skips generations?

Accepted Answer

Autosomal recessive

Question 19

A female fruit fly with genotype $$X^wX^w ($$white eyes) is crossed with a male with genotype $$X^W Y ($$red eyes). What percentage of offspring will have red eyes?

Accepted Answer

0%

Question 20

A female fruit fly with genotype $$X^W X^w ($$heterozygous for red eyes) is crossed with a male with genotype $$X^w Y ($$white eyes). What percentage of daughters will have red eyes?

Accepted Answer

50%

Mendel and the Gene: Principles of Inheritance

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