Genetics Terminology Trivia Questions!

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  • 1/15 Questions

    A chromosome is:

    • A structure that contains RNA
    • A healthy human has 47 chromosomes
    • A structure formed from a very long piece of DNA
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About This Quiz

There is a lot of new terminology associated with the study of Genetics. You will need to understand these terms in order to fully understand the concepts covered during this unit.

Genetics Terminology Trivia Questions! - Quiz

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  • 2. 

    The term homozygous means:

    • Two different copies of the allele

    • Two copies of the same allele

    • Always two copies of the dominant allele

    Correct Answer
    A. Two copies of the same allele
    Explanation
    The term homozygous refers to having two copies of the same allele. This means that both alleles for a particular gene are identical, either both being dominant or both recessive. Homozygosity can result in the expression of a specific trait or characteristic, as both alleles are the same and can work together to produce a consistent phenotype.

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  • 3. 

    Which of the following is the correct nucleotide pairings for DNA?

    • Adenine and Cytosine

    • Adenine and Uracil

    • Adenine and Thymine

    Correct Answer
    A. Adenine and Thymine
    Explanation
    The correct nucleotide pairings for DNA are Adenine and Thymine. In DNA, Adenine always pairs with Thymine through two hydrogen bonds. This pairing is essential for the complementary base pairing rule, where Adenine and Thymine form a base pair, and Cytosine and Guanine form another base pair. These base pairings are crucial for DNA replication and maintaining the genetic code.

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  • 4. 

    The term genotype refers to:

    • What the individual will look like

    • The traits of an individual

    • The genetic make up of an individual

    Correct Answer
    A. The genetic make up of an individual
    Explanation
    The term genotype refers to the genetic make up of an individual. It encompasses all the genetic information and instructions that an individual inherits from their parents, including the specific combination of genes and alleles they possess. The genotype is responsible for determining various traits and characteristics of an individual, but it does not directly determine what the individual will look like. The physical appearance or phenotype is influenced by a combination of genotype and environmental factors.

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  • 5. 

    If a homozygous black cow is crossed with a homozygous white cow, the offspring are all black and white. This type of inheritance is referred to as:

    • Incomplete Dominance

    • Co-dominance

    • X-Linked inheritance

    Correct Answer
    A. Co-dominance
    Explanation
    Co-dominance is the correct answer because when a homozygous black cow is crossed with a homozygous white cow, the offspring are not a blend of black and white, but rather have both black and white patches. This suggests that both the black and white alleles are expressed fully, without dominance or blending. In co-dominance, both alleles are equally dominant and are expressed simultaneously in the phenotype.

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  • 6. 

    The term allele means:

    • A different form of a gene

    • The name given for a trait

    • A letter used to describe a trait

    Correct Answer
    A. A different form of a gene
    Explanation
    The term allele refers to a different form of a gene. Genes can exist in multiple forms, known as alleles, which can result in variations in traits. Alleles can differ in their DNA sequence, leading to different expressions or characteristics. This concept is fundamental in understanding genetic inheritance and the diversity of traits within a population.

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  • 7. 

    The term phenotype refers to:

    • Is the observable trait of an individual

    • Is the alleles of the trait of an individual

    • Is what the individual looks like

    Correct Answer
    A. Is the observable trait of an individual
    Explanation
    The term phenotype refers to the observable trait of an individual. This means that it is the physical or biochemical characteristic that can be seen or measured, such as eye color or height. It is not referring to the alleles themselves, which are the different forms of a gene that may contribute to a trait. The phenotype is what the individual looks like, which is determined by the combination of their genetic makeup (genotype) and environmental factors.

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  • 8. 

    Meioisis is the process:

    • Where the number of chromosomes is doubled

    • Where replication occurs for normal growth and repair

    • Where gametes are produced with half the number of chromosomes

    Correct Answer
    A. Where gametes are produced with half the number of chromosomes
    Explanation
    Meiosis is the process where gametes are produced with half the number of chromosomes. During meiosis, a single cell undergoes two rounds of division, resulting in four daughter cells, each with half the number of chromosomes as the original cell. This reduction in chromosome number is essential for sexual reproduction, as it ensures that when the gametes (sperm and egg cells) combine during fertilization, the resulting offspring will have the correct number of chromosomes.

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  • 9. 

    Mitosis is the process:

    • Where the number of chromosomes doubles

    • Where replication occurs for normal growth and repair

    • Where games are produced with half the number of chromosomes

    Correct Answer
    A. Where replication occurs for normal growth and repair
    Explanation
    Mitosis is the process where replication occurs for normal growth and repair. During mitosis, a single cell divides into two identical daughter cells, each containing the same number of chromosomes as the parent cell. This process allows for the growth and repair of tissues in multicellular organisms. The other options mentioned in the question, such as doubling the number of chromosomes or producing gametes with half the number of chromosomes, are not accurate descriptions of mitosis.

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  • 10. 

    Choose the incorrect statement from the following:

    • Humans have 46 pairs of chromosomes

    • A zygote is the first cell formed when the egg and sperm meet

    • DNA stands for deoxyribonucleic acid

    Correct Answer
    A. Humans have 46 pairs of chromosomes
    Explanation
    The statement "Humans have 46 pairs of chromosomes" is incorrect because humans have 23 pairs of chromosomes, not 46 pairs. Each pair consists of one chromosome from the mother and one from the father, resulting in a total of 46 chromosomes in each cell.

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  • 11. 

    Which of the following statements is correct when describig mRNA?

    • A double stranded molecule that travels out of the nucleus and is translated at the ribosome

    • A single stranded molecule that travels out of the nucleus and is translated at the ribosome

    • A single stranded molecule where Thymine is replaced with Uracil

    Correct Answer
    A. A single stranded molecule that travels out of the nucleus and is translated at the ribosome
    Explanation
    mRNA, or messenger RNA, is a single stranded molecule that carries genetic information from the DNA in the nucleus to the ribosome in the cytoplasm. It is synthesized during transcription, where the DNA template is used to create a complementary RNA strand. In mRNA, thymine is replaced with uracil. Once in the cytoplasm, the mRNA is then translated at the ribosome to synthesize proteins based on the genetic code carried by the mRNA molecule.

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  • 12. 

    If a homozygous black feathered bird is crossed with a homzygous white feathered bird the offpsring are all grey. This type of inheritance is referred to as:

    • Incomplete dominance

    • Co-dominance

    • X linked

    Correct Answer
    A. Incomplete dominance
    Explanation
    Incomplete dominance refers to a type of inheritance where the phenotype of the heterozygous offspring is a blend or intermediate between the phenotypes of the two homozygous parents. In this case, the black feathered bird and the white feathered bird are homozygous for their respective traits, but their offspring have a phenotype of grey feathers, which is a blend of black and white. This indicates that the trait for feather color is not completely dominant or recessive, but rather exhibits incomplete dominance.

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  • 13. 

    A gene is:

    • A length of DNA that contains instructions for making a protein

    • A length of DNA that contains instructions for making a chromosome

    • A length of DNA that contains instructions for making a RNA

    Correct Answer
    A. A length of DNA that contains instructions for making a protein
    Explanation
    Genes are segments of DNA that encode the instructions for making specific proteins or functional RNA molecules. These instructions are used by cells to produce proteins, which play essential roles in the structure, function, and regulation of the body's tissues and organs.

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  • 14. 

    Translation is the process where:

    • A DNA strand is converted to a mRNA strand

    • A protein is created from the mRNA strand

    • A mRNA strand is moved from the nucleus to the ribosomes

    Correct Answer
    A. A protein is created from the mRNA strand
    Explanation
    Translation is the process in which a protein is created from the mRNA strand. During translation, the mRNA strand serves as a template for the synthesis of a protein. This process occurs in the ribosomes, where the mRNA is read and decoded, and the corresponding amino acids are brought in by transfer RNA (tRNA) molecules. The tRNA molecules attach to the mRNA strand, allowing the ribosomes to link the amino acids together in the correct order to form a protein.

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  • 15. 

    When a homozygous dominat Tall plant is crossed with a homozygous recessive short plant, the genotype ratio would be:

    • 100% tall plants

    • 100% Tt

    • 50% Tall and 50% short

    Correct Answer
    A. 100% Tt
    Explanation
    When a homozygous dominant Tall plant (TT) is crossed with a homozygous recessive short plant (tt), the offspring will all have the genotype Tt. This is because the dominant allele (T) will always be expressed over the recessive allele (t), resulting in all tall plants. Therefore, the genotype ratio would be 100% Tt.

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  • Jun 17, 2024
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    ProProfs Editorial Team
  • Oct 18, 2012
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    Bvandergert
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