Question 1

Which of the following best describes incomplete dominance?

Accepted Answer

The heterozygote shows a phenotype that is intermediate between the two homozygotes.

Question 2

A dihybrid cross between two pea plants heterozygous for seed shape (R = round, r = wrinkled) and seed color (Y = yellow, y = green) produces which phenotypic ratio in the offspring?

Accepted Answer

$$9:3:3:1$$

Question 3

Which of the following is a common misconception about dominant alleles?

Accepted Answer

All of the above.

Question 4

In the ABO blood group system, which genotype(s) result in blood type AB?

Accepted Answer

$$I^A I^B$$

Question 5

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

Accepted Answer

$$\frac{1}{2}$$

Question 6

Which of the following best describes polygenic inheritance?

Accepted Answer

Multiple genes contribute to a phenotype that shows continuous variation.

Question 7

If a person with genotype $$I^A i$$ for the ABO blood group receives a blood transfusion, which blood types can they safely receive?

Accepted Answer

Type A and Type O

Question 8

Which of the following statements about sex chromosomes in humans is TRUE?

Accepted Answer

The Y chromosome contains the SRY gene, which triggers male development.

Question 9

A woman with normal vision (not a carrier) and a man who is colorblind have a son. What is the probability that their son will be colorblind?

Accepted Answer

$$0$$

Question 10

Which of the following is an example of co-dominance?

Accepted Answer

A flower with red and white patches from red and white parents.

Question 11

How many chromosomes do humans have in their somatic cells?

Accepted Answer

$$46$$

Question 12

Which of the following best explains why a blue-eyed child can be born to two brown-eyed parents?

Accepted Answer

Both parents are heterozygous for the brown eye allele.

Question 13

Which of the following is TRUE about homologous chromosomes?

Accepted Answer

They have the same genes but may have different alleles.

Question 14

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

Accepted Answer

Phenotypes are discrete and limited to two options.

Question 15

A man with type AB blood and a woman with type O blood have a child. What are the possible blood types for their child?

Accepted Answer

Type A or Type B

Question 16

Which of the following is TRUE about the universal donor in the ABO blood group system?

Accepted Answer

Type O blood is the universal donor because it has no A or B antigens on the surface of red blood cells.

Question 17

Which of the following best describes the difference between a gene and a chromosome?

Accepted Answer

A gene is a segment of DNA that codes for a trait, while a chromosome is a structure made of DNA and proteins that contains many genes.

Question 18

Which of the following is an example of a trait determined by multiple alleles?

Accepted Answer

The C gene for coat color in bunnies, which has four alleles.

Question 19

Which of the following is TRUE about X-linked recessive inheritance?

Accepted Answer

Males are more likely to express the trait because they have only one X chromosome.

Non-Mendelian Inheritance & Sex-linked Traits: Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards