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Unit 2: Genetics and Molecular Biology

Study guide for CLEP CLEP Biology — Unit 2: Genetics and Molecular Biology. Practice questions, key concepts, and exam tips.

88

Practice Questions

39

Flashcards

9

Key Topics

Key Concepts to Study

Mendelian inheritance
DNA replication
gene expression
biotechnology techniques
sex-linked traits
linkage and recombination
polygenic inheritance
multiple alleles
non-Mendelian inheritance

Sample Practice Questions

Try these 5 questions from this unit. Sign up for full access to all 88.

Q1MEDIUM

What type of inheritance pattern is observed in ABO blood type?

A) Codominance
B) Sex-linked
C) Dominant-recessive
D) Polygenic
E) Incomplete dominance
Show Answer

Answer: A — Codominance is correct because both A and B alleles have equal effect, and the individual expresses both.

Q2HARD

What is the term for the process by which a single gene can have multiple different effects on an organism's phenotype?

A) Polygenic inheritance
B) Pleiotropy
C) Mutation
D) Genetic drift
E) Epigenetics
Show Answer

Answer: B — Pleiotropy occurs when one gene influences two or more seemingly unrelated phenotypic traits. This is a key concept in understanding the complex relationships between genotype and phenotype.

Q3MEDIUM

What type of inheritance pattern does the ABO blood type exhibit?

A) Incomplete dominance
B) Dominant-recessive
C) Codominance
D) Sex-linked inheritance
E) Polygenic inheritance
Show Answer

Answer: C — The ABO blood type exhibits Codominance, where two alleles have an equal effect on the phenotype, resulting in a combination of both. This occurs because both the A and B alleles are expressed fully, producing both A and B antigens on red blood cells. In contrast to incomplete dominance, where one allele is partially expressed, Codominance allows both alleles to be fully expressed, making it distinct. This is why dominant-recessive inheritance, where one allele masks the other, does not apply to ABO blood types.

Q4EASY

What type of cells are produced by meiosis in humans?

A) Somatic cells
B) Diploid gametes
C) Haploid gametes
D) Triploid zygotes
E) Tetraploid embryos
Show Answer

Answer: C — Haploid gametes is correct because meiosis produces haploid gametes.

Q5MEDIUM

What is the term for the movement of a chromosome segment to a non-homologous chromosome?

A) Gene conversion
B) Crossing over
C) Translocation
D) Independent assortment
E) Mutation
Show Answer

Answer: C — Translocation is correct because translocation involves the transfer of a segment to a non-homologous chromosome.

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Study Tips for Unit 2: Genetics and Molecular Biology

  • Focus on understanding concepts, not memorizing facts — CLEP tests application
  • Practice with timed questions to build exam-day speed
  • Review explanations for wrong answers — they reveal common misconceptions
  • Use flashcards for key terms, practice questions for deeper understanding

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