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Genetics and Hereditary Traits Quiz

#1

Which molecule carries the genetic instructions used in the growth, development, functioning, and reproduction of all known living organisms?

DNA
Explanation

Genetic instructions carrier

#2

Which of the following is not a basic law of genetics?

Law of Conservation of Mass
Explanation

Not a law of genetics

#3

Which scientist is known as the father of modern genetics?

Gregor Mendel
Explanation

Father of modern genetics

#4

What is the term for the process by which DNA is copied to produce a complementary strand of RNA?

Transcription
Explanation

DNA to RNA copying

#5

Which type of genetic mutation involves the insertion or deletion of nucleotides, shifting the reading frame of the genetic code?

Frameshift
Explanation

Nucleotide insertion/deletion mutation

#6

What term describes a group of genes that are inherited together because they are located close to one another on the same chromosome?

Linked genes
Explanation

Proximity-inherited genes

#7

Which enzyme is responsible for unwinding and separating the DNA double helix during DNA replication?

Helicase
Explanation

DNA helix unwinding enzyme

#8

What is the term for a segment of DNA that codes for a specific functional product, usually a protein?

Gene
Explanation

Functional DNA segment

#9

Which of the following statements about homologous chromosomes is true?

They carry the same genes at the same loci
Explanation

Same gene loci on homologous chromosomes

#10

What is the term for a type of cell division that results in two daughter cells each having the same number and kind of chromosomes as the parent nucleus?

Mitosis
Explanation

Chromosome duplication cell division

#11

In humans, which pair of chromosomes determines the biological sex of an individual?

XY
Explanation

Sex-determining chromosomes

#12

What term describes the observable characteristics or traits of an organism?

Phenotype
Explanation

Observable traits

#13

In a Punnett square, what represents the possible genotypes of offspring?

Cells
Explanation

Offspring genotypes

#14

Which of the following statements about dominant alleles is true?

They always determine the phenotype when present
Explanation

Dominant allele phenotypic effect

#15

In humans, which blood type is considered the universal donor?

O
Explanation

Universal donor blood type

#16

Which of the following genetic disorders is caused by a mutation in the CFTR gene?

Cystic Fibrosis
Explanation

CFTR gene mutation disorder

#17

In a dihybrid cross, how many different phenotypic ratios are possible in the offspring?

4
Explanation

Four phenotypic ratios

#18

Which of the following is an example of a sex-linked genetic disorder?

Color blindness
Explanation

Sex-linked disorder example

#19

Which of the following statements about X-linked inheritance is true?

Females are more likely to express X-linked traits than males
Explanation

Female-biased X-linked trait expression

#20

In a pedigree analysis, which symbol represents a male individual?

Square
Explanation

Male individual symbol

#21

Which of the following genetic disorders is caused by the presence of an extra chromosome 21?

Down Syndrome
Explanation

Extra chromosome 21 disorder

#22

What is the term for a gene that masks the effect of another gene at the same locus?

Epistatic
Explanation

Gene masking effect

#23

What is the term for a type of inheritance where the phenotype of a heterozygote is intermediate between the phenotypes of the two homozygotes?

Incomplete dominance
Explanation

Intermediate phenotype inheritance

#24

What is the term for the phenomenon where one gene influences multiple, seemingly unrelated phenotypic traits?

Pleiotropy
Explanation

One gene, multiple traits effect

#25

What is the term for a type of mutation that involves the substitution of one nucleotide for another?

Substitution
Explanation

Single nucleotide change mutation

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