Definition Of Genetics Quiz Questions

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    What is the probability of rolling a six sided die and it landing on 2?

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Definition Of Genetics Quiz Questions - Quiz

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  • 2. 

    Homozygous is _____________.

    • The lower case alleles

    • Members of a gene pair that are the same

    • Members of a gene pair that are different

    Correct Answer
    A. Members of a gene pair that are the same
    Explanation
    Homozygous refers to the condition where an individual has two identical alleles for a particular gene. In other words, both members of the gene pair are the same. This condition is important in genetics as it determines the expression of certain traits and can influence the inheritance pattern of genetic disorders.

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  • 3. 

    Heterozygous is __________________.

    • Members of a gene pair that are different

    • Members of a gene pair that are the same.

    • The upper case alleles

    Correct Answer
    A. Members of a gene pair that are different
    Explanation
    Heterozygous refers to the condition where an individual has two different alleles for a particular gene. In this context, it specifically refers to the members of a gene pair that are different from each other. This means that the individual has inherited one allele from one parent and a different allele from the other parent for that specific gene.

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  • 4. 

    A cross is made between two parents, both with genotype Aa. What is the probability that an offspring will have the genotype aa?

    • 1/4

    • 1/8

    • 1/2

    Correct Answer
    A. 1/4
    Explanation
    When two parents with genotype Aa are crossed, they can produce four possible genotypes in their offspring: AA, Aa, aA, and aa. Since the genotype aa is only one out of the four possible genotypes, the probability of an offspring having the genotype aa is 1/4.

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  • 5. 

    The genotype is ________________.

    • Physical appearance

    • The letters used to indicate the presence of a gene

    • Masked by the dominant gene

    Correct Answer
    A. The letters used to indicate the presence of a gene
    Explanation
    The correct answer is "The letters used to indicate the presence of a gene". This is because in genetics, genotypes are represented by letters that indicate the presence of specific genes. Each letter represents a different allele or variant of a gene. By using letters, scientists can easily identify and communicate the different genotypes of individuals.

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  • 6. 

    What is the probability of a coin landing on tails four times in a row?

    Correct Answer
    1/16
    Explanation
    The probability of a coin landing on tails four times in a row can be calculated by multiplying the probability of getting tails on each individual flip. Since the coin has two sides (heads and tails) and each flip is independent, the probability of getting tails on a single flip is 1/2. Therefore, the probability of getting tails four times in a row is (1/2) * (1/2) * (1/2) * (1/2) = 1/16.

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  • 7. 

    In Guinea pigs, black hair is dominant over white hair. If a homozygous black guinea pig is crossed with a white guinea pig, the offspring will be:

    • All white

    • All black

    • 1/2 black and 1/2 white

    Correct Answer
    A. All black
    Explanation
    When a homozygous black guinea pig (BB) is crossed with a white guinea pig (bb), the genotype of the offspring will be heterozygous black (Bb). Since black hair is dominant over white hair, all the offspring will have black hair. Therefore, the correct answer is "All black."

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  • 8. 

    What are the gametes of a parent with the genotype BbSs

    • BB,BS,bs,Bs

    • BS,Bs,bs,bs

    • BS,Bs,bS,bs

    Correct Answer
    A. BS,Bs,bS,bs
    Explanation
    The gametes of a parent with the genotype BbSs would be BS, Bs, bS, and bs. This is because during meiosis, the parent's two alleles for each gene (B and b, S and s) segregate, resulting in four possible combinations of these alleles in the gametes.

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  • 9. 

    A recessive trait is _______________________.

    • Is masked by the dominant gene

    • The letters used to indicate the presence of a gene

    • Physical appearance

    Correct Answer
    A. Is masked by the dominant gene
    Explanation
    A recessive trait refers to a gene that is only expressed or visible when an individual inherits two copies of that gene, one from each parent. In the presence of a dominant gene, which is a gene that is always expressed or visible, the recessive gene is "masked" or not expressed. This means that the dominant gene takes precedence over the recessive gene, resulting in the dominant trait being observed instead of the recessive trait.

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  • 10. 

    In Mendel's garden peas, the tall allele (D) is dominant over the dwarf allele (d), and the green pod allele is dominant (Y) over the yellow pod allele (y). Using the symbols provided above, what is the genotype of a heterozygous tall, homozygous green pod pea plant?

    • DdYy

    • DDYy

    • DdYY

    Correct Answer
    A. DdYY
    Explanation
    The genotype of a heterozygous tall, homozygous green pod pea plant is DdYY. This means that the plant has one dominant tall allele (D) and one recessive dwarf allele (d), as well as two dominant green pod alleles (Y). Since the tall allele is dominant over the dwarf allele, the plant will be tall. Similarly, since the green pod allele is dominant over the yellow pod allele, the plant will have green pods.

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  • 11. 

    This individual carries the recessive trait but it is not apparent.

    • Homozygous dominant

    • Homozygous recessive

    • Heterozygous

    Correct Answer
    A. Heterozygous
    Explanation
    The individual carries the recessive trait but it is not apparent, indicating that they have one dominant allele and one recessive allele. This makes them heterozygous, as they have different alleles for the trait.

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  • 12. 

    A dominat trait is _____________________.

    • Members of a gene pair that are different

    • Physical appearance

    • Expressed if present

    Correct Answer
    A. Expressed if present
    Explanation
    A dominant trait refers to a gene that is expressed and produces a specific characteristic or phenotype when it is present in an individual's genetic makeup. This means that even if there is only one copy of the dominant gene, it will override the presence of any recessive gene and be expressed in the physical appearance of the individual. The dominant trait is not dependent on the presence of other traits or the physical appearance, but rather on the expression of the gene itself.

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  • Current Version
  • Mar 21, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Nov 19, 2009
    Quiz Created by
    Tarsha04
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