Genetics Basics Quiz

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Questions and Answers

What is the basic unit of heredity?

Gene (correct)
DNA
Allele
Chromosome

Which of the following pairs of nitrogenous bases are found in DNA?

Adenine - Thymine, Cytosine - Guanine (correct)
Adenine - Thymine, Cytosine - Uracil
Uracil - Thymine, Cytosine - Guanine
Adenine - Uracil, Cytosine - Guanine

What is the term used to describe the combination of alleles an organism inherits from its parents?

Variation
Genotype (correct)
Heredity
Phenotype

Which of the following represents a dominant trait?

Capital letter (A) Signup and view all the answers

What is the term used to describe the physical appearance or expression of traits in an organism?

Phenotype (A) Signup and view all the answers

What is the term used to describe the diversity or differences between individuals or populations?

Variation (D) Signup and view all the answers

What is the Law of Segregation?

Each inherited trait is defined by a gene pair, and parental genes are randomly separated to the sex cells. (D) Signup and view all the answers

What does the Law of Independent Assortment state?

Genes for different traits are sorted separately from one another so that the inheritance of one trait is not dependent on the inheritance of another. (C) Signup and view all the answers

What is the Law of Dominance?

An organism with alternate forms of a gene will express the form that is dominant. (B) Signup and view all the answers

What is complete dominance?

It occurs when one allele or version of a gene completely masks another. (B) Signup and view all the answers

What is incomplete dominance?

It refers to a circumstance in which the two copies of a gene for a particular trait, or alleles, combine so that neither dominates the other. (B) Signup and view all the answers

What is codominance?

It is a relationship between two versions of a gene where neither allele is recessive, and the phenotypes of both alleles are expressed. (B) Signup and view all the answers