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Free Practice Quiz Question List

08 Genetics and Inheritance Online Quiz Questions

Use this free practice quiz with 20 questions to review 08 Genetics and Inheritance, test your knowledge, and prepare for your next test or exam.

20 questions
01
True or false
1 point

True or false: In a Mendelian model, a dominant allele is necessarily more common in the population than a recessive allele.

  1. A

    True

  2. B

    False

02
Choose one
1 point

Which statement best describes Mendel’s law of segregation?

  1. A

    Each gamete receives both alleles of the gene.

  2. B

    The two alleles separate, and each gamete receives one allele.

  3. C

    The two alleles combine into a new allele before fertilization.

  4. D

    Only the dominant allele enters gametes.

03
Written response
1 point

What term describes an individual that carries two different alleles of a gene, such as Yy?

04
Fill in the blank
1 point

Complete the statements: Alternative DNA sequences of the same gene are called , and the corresponding positions of a gene on homologous chromosomes are called .

05
Choose one
1 point

Two carrier parents have an autosomal recessive condition, so their cross is Aa × Aa. What is the probability that their next two children are both unaffected?

  1. A

    1/4

  2. B

    1/2

  3. C

    9/16

  4. D

    3/4

06
True or false
1 point

True or false: Independent assortment applies strictly to genes that are closely linked on the same chromosome.

  1. A

    True

  2. B

    False

07
Fill in the blank
1 point

Complete the statements: When a heterozygote has an intermediate phenotype, the pattern is . When both alleles are expressed in the heterozygote, the pattern is .

08
Written response
1 point

What term describes the proportion of individuals with a particular genotype who actually express its phenotype?

09
Choose all
1 point

Which three statements correctly describe standard pedigree conventions? Select all correct choices.

  1. A

    A square represents a male.

  2. B

    A horizontal line represents a parent-to-offspring connection.

  3. C

    A circle represents a female.

  4. D

    A shaded symbol represents an individual expressing the trait.

  5. E

    Roman numerals identify individuals within a generation.

10
Choose one
1 point

Under the simple X-linked inheritance model, what transmission pattern is expected for an affected father’s X-linked allele?

  1. A

    An affected father passes an X-linked allele to all sons.

  2. B

    An affected father passes an X-linked allele to all daughters and to no sons.

  3. C

    An affected father passes an X-linked allele to half of his daughters and half of his sons.

  4. D

    An affected father passes an X-linked allele only to sons who are also affected.

11
Choose all
1 point

Which three processes can generate genetic variation or new combinations of alleles? Select all correct choices.

  1. A

    Mutation

  2. B

    Crossing over during meiosis

  3. C

    Translation of mRNA into protein

  4. D

    Independent assortment during meiosis

  5. E

    Conversion of a phenotype directly into a genotype

12
Open ended
1 point

A plant with genotype AaBb is crossed with a plant having genotype aabb. Assuming the two genes assort independently, determine the expected offspring genotype classes and the probability of each class. Explain your reasoning.

13
Choose one
1 point

In a seed-color model where Y is completely dominant to y, what phenotype and genotype describe an individual with genotype Yy?

  1. A

    Green seeds, genotype homozygous recessive

  2. B

    Yellow seeds, genotype heterozygous

  3. C

    Yellow seeds, genotype homozygous recessive

  4. D

    Green seeds, genotype heterozygous

14
Choose one
1 point

Two carrier parents have an autosomal recessive condition: Aa × Aa. What is the probability that their next two children will both be unaffected?

  1. A

    1/4

  2. B

    3/8

  3. C

    9/16

  4. D

    3/4

15
True or false
1 point

True or false: In X-linked recessive inheritance, an affected father can transmit the disease-associated allele directly to his sons.

  1. A

    True

  2. B

    False

16
Written response
1 point

Two carriers of an autosomal recessive condition have an unaffected child. What is the probability that this child is a carrier?

17
Choose one
1 point

An individual shows a dominant phenotype and is crossed with an aa individual. Which result would indicate that the unknown individual is heterozygous?

  1. A

    All offspring show the dominant phenotype

  2. B

    All offspring show the recessive phenotype

  3. C

    One-quarter dominant and three-quarters recessive

  4. D

    Approximately one-half dominant and one-half recessive

18
Written response
1 point

What Mendelian principle explains why an AaBb individual can produce AB, Ab, aB, and ab gametes in approximately equal proportions when the genes are unlinked?

19
Choose one
1 point

A trait affects males and females at similar frequencies, appears in successive generations, and includes father-to-son transmission. Which inheritance pattern is most consistent with these observations?

  1. A

    Autosomal dominant inheritance

  2. B

    Autosomal recessive inheritance

  3. C

    X-linked recessive inheritance

  4. D

    Mitochondrial inheritance

20
Choose one
1 point

Which transmission pattern is most characteristic of a mitochondrial variant under the usual model?

  1. A

    An affected father transmits the variant to all sons only

  2. B

    An affected mother may transmit the variant to all of her children

  3. C

    Both parents transmit the variant equally to every child

  4. D

    Only daughters can inherit the variant from an affected mother