Question 1

Which of the following best describes the purpose of a pedigree chart in genetics?

Accepted Answer

To trace the inheritance of traits through several family generations

Question 2

A heterozygous individual for a trait (Aa) is crossed with a homozygous recessive individual (aa). What is the expected genotypic ratio of the offspring?

Accepted Answer

1 Aa : 1 aa

Question 3

Which process is responsible for the synthesis of proteins from mRNA?

Accepted Answer

Translation

Question 4

During transcription, which enzyme is responsible for synthesizing RNA from a DNA template?

Accepted Answer

RNA polymerase

Question 5

A mutation changes the codon UAU (tyrosine) to UAA. What type of mutation has occurred?

Accepted Answer

Nonsense mutation

Question 6

Which of the following best explains the law of independent assortment?

Accepted Answer

Alleles for different traits segregate independently during gamete formation

Question 7

In a dihybrid cross between two heterozygous individuals (AaBb x AaBb), what is the expected phenotypic ratio of the offspring?

Accepted Answer

$$9:3:3:1$$

Question 8

Which molecule carries amino acids to the ribosome during translation?

Accepted Answer

tRNA

Question 9

A frameshift mutation occurs when:

Accepted Answer

A nucleotide is inserted or deleted, altering the reading frame

Question 10

Which of the following is an example of codominance?

Accepted Answer

A person with type AB blood expresses both A and B antigens equally

Question 11

Which statement best describes the role of the start codon in protein synthesis?

Accepted Answer

It initiates translation by signaling where the ribosome should begin assembling the protein

Question 12

A genetic disorder is caused by a mutation in a single gene. Which type of inheritance pattern is most likely?

Accepted Answer

Single-gene (Mendelian) inheritance

Question 13

Which of the following best describes the function of a Punnett square?

Accepted Answer

To predict the probability of offspring genotypes from parental crosses

Question 14

Which process occurs during meiosis and increases genetic variation in gametes?

Accepted Answer

Crossing over

Question 15

A patient has a mutation that does not change the amino acid sequence of the protein. What type of mutation is this?

Accepted Answer

Silent mutation

Question 16

Which of the following is true about the central dogma of molecular biology?

Accepted Answer

DNA is transcribed into RNA, which is then translated into protein

Question 17

If a child inherits a recessive genetic disorder, which of the following must be true about the parents?

Accepted Answer

Both parents must carry at least one recessive allele

Question 18

Which of the following best explains why sickle cell anemia persists in populations where malaria is common?

Accepted Answer

Sickle cell allele provides resistance to malaria in heterozygotes

Question 19

A scientist is studying a population where the frequency of allele A is $$0.6$$ and allele a is $$0.4. $$According to the Hardy-Weinberg equation, what is the expected frequency of heterozygotes ($$Aa$$)?

Accepted Answer

$$0.48$$

Question 20

Which of the following scenarios best illustrates incomplete dominance?

Accepted Answer

A cross between a red-flowered plant and a white-flowered plant produces pink-flowered offspring

Genetics & Protein Synthesis: Study Guide and Learning Targets (Unit 4, Honors Biology)

Study Guide - Practice Questions

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