Question 1

Gregor Mendel chose pea plants for his inheritance studies primarily because:

Accepted Answer

They have a short generation time and produce many offspring, allowing for statistical analysis of inheritance patterns.

Question 2

In Mendel’s experiments, what is the difference between a character and a trait?

Accepted Answer

A character is a heritable feature, such as flower color, while a trait is a variant of that character, such as purple or white flowers.

Question 3

A true-breeding pea plant with purple flowers is crossed with a true-breeding plant with white flowers. All offspring in the F1 generation have purple flowers. What does this demonstrate about the purple flower allele?

Accepted Answer

The purple allele is dominant over the white allele.

Question 4

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

Accepted Answer

Alleles for a gene separate during gamete formation so that each gamete carries only one allele for each gene.

Question 5

How many alleles for a given gene are present in a typical human somatic cell and in a gamete, respectively?

Accepted Answer

Two in a somatic cell, one in a gamete.

Question 6

A plant with genotype $$YyRr ($$yellow, round seeds) is crossed with a plant with genotype $$yyrr ($$green, wrinkled seeds). According to Mendel’s Law of Independent Assortment, what is the expected phenotypic ratio in the offspring?

Accepted Answer

1 yellow round : 1 yellow wrinkled : 1 green round : 1 green wrinkled

Question 7

Which of the following scenarios best illustrates incomplete dominance?

Accepted Answer

A cross between red-flowered and white-flowered snapdragons produces pink-flowered offspring.

Question 8

In a human pedigree, a filled square represents a male with a particular trait. If the trait is recessive, what is the genotype of this individual?

Accepted Answer

Homozygous recessive ($$aa)$$

Question 9

Which statement best explains why white eyes appeared only in male fruit flies in the F2 generation of Morgan’s experiments?

Accepted Answer

The gene for eye color is located on the X chromosome, and males have only one X chromosome.

Question 10

How does the behavior of chromosomes during meiosis explain Mendel’s Law of Independent Assortment?

Accepted Answer

Homologous chromosomes align and separate independently during metaphase I, leading to random assortment of alleles.

Question 11

Which of the following best describes codominance?

Accepted Answer

Both alleles are fully expressed in the phenotype of a heterozygote.

Question 12

A woman who is heterozygous for a sex-linked recessive disorder (on the X chromosome) has children with a man who does not have the disorder. What is the probability that their son will have the disorder?

Accepted Answer

$$0.5$$

Question 13

Which of the following statements about X inactivation is correct?

Accepted Answer

In female mammals, one X chromosome in each cell is randomly inactivated during early embryonic development.

Question 14

If two genes are located close together on the same chromosome, which of the following is most likely true?

Accepted Answer

They are genetically linked and tend to be inherited together.

Question 15

A Punnett square is used to:

Accepted Answer

Predict the possible genotypes and phenotypes of offspring from a genetic cross.

Question 16

Which of the following best describes the chromosome theory of inheritance?

Accepted Answer

Genes are located on chromosomes, and the behavior of chromosomes during meiosis accounts for inheritance patterns.

Question 17

A pedigree shows a trait that appears in every generation and affects both males and females equally. What is the most likely mode of inheritance?

Accepted Answer

Autosomal dominant

Question 18

Which of the following is true about gamete formation in a heterozygous individual ($$Aa) $$according to Mendel’s law of segregation?

Accepted Answer

Half the gametes will carry the $$A$$ allele and half will carry the $$a$$ allele.

Question 19

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

Accepted Answer

AB blood type, where both A and B antigens are expressed on red blood cells.

Question 20

A man with genotype $$X^A Y$$ and a woman with genotype $$X^A X^a$$ have a daughter. What is the probability that she will be a carrier for an X-linked recessive trait?

Accepted Answer

$$0.5$$

Mendelian Genetics and Chromosomal Inheritance: Guided Study for BIOL 1301

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