Question 1

Which of the following best describes the process of fertilization in humans?

Accepted Answer

The fusion of a sperm cell and an egg cell, resulting in a zygote with a diploid set of chromosomes.

Question 2

During embryonic development, which stage is characterized by the formation of three germ layers?

Accepted Answer

Gastrulation

Question 3

Which embryonic layer gives rise to the nervous system and skin?

Accepted Answer

Ectoderm

Question 4

A genetic cross between two individuals heterozygous for a single gene (Aa x Aa) is called a:

Accepted Answer

Monohybrid cross

Question 5

Which of the following best illustrates incomplete dominance?

Accepted Answer

A cross between red and white flowers produces pink flowers.

Question 6

If a trait is controlled by multiple genes, such as human height, this is an example of:

Accepted Answer

Polygenic inheritance

Question 7

Which of the following statements about alleles is correct?

Accepted Answer

Alleles are different forms of a gene found at the same locus on homologous chromosomes.

Question 8

In a pedigree, what does a half-colored circle represent?

Accepted Answer

A heterozygous female

Question 9

Which principle explains why alleles for different traits are distributed to gametes independently?

Accepted Answer

Principle of Independent Assortment

Question 10

A test cross is used to determine:

Accepted Answer

Whether an individual with a dominant phenotype is homozygous or heterozygous.

Question 11

If a parent with genotype AaBb is crossed with another parent with genotype AaBb, what is the probability of producing an offspring with genotype aabb? (Assume independent assortment.)

Accepted Answer

$$\frac{1}{16}$$

Question 12

Which of the following best describes the function of programmed cell death (apoptosis) during development?

Accepted Answer

It removes unnecessary cells to help shape structures.

Question 13

Which of the following is NOT a correct match between a genetic term and its definition?

Accepted Answer

Autosome: a chromosome that determines sex

Question 14

A woman with genotype X	extsuperscript{A}X	extsuperscript{a} (where A is dominant and a is recessive) and a man with genotype X	extsuperscript{a}Y have a child. What is the probability that their child will be a carrier female?

Accepted Answer

$$\frac{1}{4}$$

Question 15

Which of the following is an example of codominance?

Accepted Answer

A person with AB blood type expressing both A and B antigens.

Question 16

Which process ensures that each gamete receives only one allele for each gene?

Accepted Answer

Principle of Segregation

Question 17

In the diagram provided, what does label 'b' represent?

Accepted Answer

Gene locus

Question 18

Which of the following best describes the difference between genotype and phenotype?

Accepted Answer

Genotype is the genetic makeup; phenotype is the physical appearance.

Question 19

Which of the following is a real-life example of polygenic inheritance?

Accepted Answer

Human skin color

Question 20

If a pedigree shows a trait that appears only in males and skips generations, what is the most likely mode of inheritance?

Accepted Answer

X-linked recessive

Genetics Vocabulary and Concepts: Guided Study

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