Question 1

Which of the following best describes the Law of Segregation as proposed by Mendel?

Accepted Answer

Each individual has two alleles for each gene, and these alleles separate during gamete formation so that each gamete receives only one allele.

Question 2

A plant with genotype Pp (where P = purple, p = white) is crossed with another Pp plant. What is the expected phenotype ratio of their offspring?

Accepted Answer

$$3:1 ($$purple:white)

Question 3

Which of the following is an example of codominance?

Accepted Answer

Human ABO blood groups, where both A and B alleles are expressed in AB individuals.

Question 4

A colorblind male (XᶜY) mates with a carrier female (XᶜX). What percentage of their daughters will be colorblind?

Accepted Answer

$$25\%$$

Question 5

Which of the following statements best explains why males are more likely to express recessive X-linked traits?

Accepted Answer

Males have only one X chromosome, so a single recessive allele will be expressed.

Question 6

Which genetic disorder is inherited as a dominant trait?

Accepted Answer

Huntington disease

Question 7

Why does sickle-cell disease persist in certain populations despite being harmful?

Accepted Answer

Carriers of the sickle-cell allele have increased resistance to malaria, providing a selective advantage in regions where malaria is common.

Question 8

A couple, both carriers for sickle-cell anemia (genotype Aa), have a child. What is the probability that their child will be a carrier (heterozygous)?

Accepted Answer

$$1/2$$

Question 9

Which of the following best illustrates pleiotropy?

Accepted Answer

A single gene mutation in nude mice causes both hairlessness and immune system defects.

Question 10

Which scenario best demonstrates polygenic inheritance?

Accepted Answer

Human skin color, which is influenced by several genes.

Question 11

If a gene is located at a specific locus on a chromosome, what does 'locus' refer to?

Accepted Answer

The physical location of a gene on a chromosome.

Question 12

Which of the following best describes a genotype?

Accepted Answer

The genetic makeup of an organism, including its alleles.

Question 13

A true-breeding plant is crossed with a hybrid. Which of the following is true about the offspring?

Accepted Answer

The offspring will have a 1:1 ratio of true-breeding to hybrid genotypes.

Question 14

Which of the following is an example of how environment can influence gene expression in humans?

Accepted Answer

Identical twins raised in different environments may have different skin tones due to sun exposure.

Question 15

Which of the following best describes the Law of Independent Assortment?

Accepted Answer

Alleles for different genes separate independently during gamete formation.

Question 16

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

$$50\%$$

Question 17

Which of the following best explains the importance of understanding alleles and inheritance in the context of CRISPR and sickle-cell disease?

Accepted Answer

It helps researchers design gene-editing strategies to target the specific allele responsible for the disease.

Question 18

Which of the following best describes a heterozygous genotype?

Accepted Answer

An individual with two different alleles for a gene.

Question 19

Dr. Ernest Everett Just’s research on cell structure contributed to genetics by:

Accepted Answer

Showing that the structure and function of the cell, including the nucleus, are essential for understanding how genes are inherited and expressed.

Question 20

A couple, both carriers for sickle-cell anemia (Aa × Aa), have a child. What is the probability that their child will have sickle-cell disease?

Accepted Answer

$$1/4$$

Chapter 11: Patterns of Inheritance – Guided Study Support

Guida di studio - Domande di pratica

Study guide - Flashcard