Basics of DNA and Heredity Quiz

What is the shape of the DNA molecule?

• Square

• Single-stranded helix

• Double helix

• Circle

Answer explanation

The shape of the DNA molecule is a double helix, consisting of two strands twisted around each other.

What is the main function of DNA in cells?

• To create energy for the cell

• To store and transmit genetic information

• To help in the digestion of food

• To protect the cell from external damage

Answer explanation

DNA's main function is to store and transmit genetic information, allowing for the inheritance of traits and the production of proteins.

Tags

NGSS.HS-LS3-1

In a Punnett square, what does each box represent?

• A possible trait

• A dominant gene

• A recessive gene

• A possible genotype of offspring

Answer explanation

Each box in a Punnett square represents a possible genotype of offspring.

What is a phenotype?

• The genetic makeup of an organism

• The physical appearance of an organism

• A type of gene

• A type of DNA molecule

Answer explanation

A phenotype refers to the physical appearance of an organism. Ex: Hair color, long tail, beak shape

What does it mean if a trait is recessive?

• It appears every generation

• It is the most common trait

• It only appears when two recessive alleles are present

• It is always harmful

Answer explanation

A recessive trait only appears when two recessive alleles are present.

What are the building blocks of DNA?

• Amino acids

• Nucleotides

• Proteins

• Carbohydrates

Answer explanation

The building blocks of DNA are nucleotides. Nucleotides are the units that make up DNA and consist of a sugar, a phosphate group, and a nitrogenous base.

How many alleles do you inherit from each parent for a particular gene?

• One

• Two

• Three

• Four

Answer explanation

You inherit one allele from each parent for a particular gene.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

What is heredity?

• The study of cells

• The process of aging

• The passing of traits from parents to offspring

• The mutation of genes

Answer explanation

Heredity is the passing of traits from parents to offspring.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Which of the following is NOT a component of a nucleotide in DNA?

• Phosphate group

• Ribose sugar

• Nitrogenous base

• Amino acid

Answer explanation

Amino acid is not a component of a nucleotide in DNA. Nucleotides consist of a phosphate group, ribose sugar, and a nitrogenous base.

In a Punnett square, what does a capital letter represent?

• A recessive allele

• A dominant allele

• A heterozygous pair

• A phenotype

Answer explanation

A capital letter in a Punnett square represents a dominant allele.