BIO 340 Final Exam Practice Questions Latest Update Questions and 100% Verified Correct Answers Guaranteed A+

BIO 340 Final Exam Practice Questions Latest
Update 2025-2026 120 Questions and 100%
Verified Correct Answers Guaranteed A+
A __________ is a diagram showing the matings and offspring arising from each couple
through generations.



A. Test cross
B. Pedigree

C. Gene flowchart

D. Mendelian chart - CORRECT ANSWER: B. Pedigree



A bacterium is unable to transport lactose into the cell to be broken down. Which gene
is likely mutated in this bacterium?



A. lacZ

B. lacY

C. lacI
D. lacP

E. lacO - CORRECT ANSWER: B. lacY



A gene is __________ when it contributes to more than one phenotype.



A. Very powerful

B. Ultra-dominant
C. Pluripotent

D. Pleiotropic - CORRECT ANSWER: D. Pleiotropic

,A geneticist is studying flower-color mutations in petunias. He finds two recessive
mutants that have white flowers, rather than the wildtype purple. He crosses a
homozygote for the first mutation with a homozygote for the second mutation. All the
offspring have white flowers. Which of the following offspring is the best way to write the
genotype of these offspring?



A. Aa
B. aa

C. a1a1

D. a1a2
E. Aa1Bb1 - CORRECT ANSWER: D. a1a2



A population of flies is polymorphic for gene A. The gene has two alleles, A and a. The
population is made up of the following genotypes: AA(0.2), Aa(0.2), aa(0.6). Is this
population in Hardy-Weinberg equilibrium?



A. Yes

B. No - CORRECT ANSWER: B. No


A population of mice has two color morphs: white and agouti. The difference is due to a
single gene with two alleles; agouti is dominant over white. In the population, the
frequency of the agouti allele is 0.4 and that of the white allele is 0.6. In a population of
50 mice, how many are heterozygotes for this gene?



A. 0.48

B. 48
C. 50

D. 24

E. None - CORRECT ANSWER: D. 24

,A portion of mRNA attached to a ribosome reads:

5' GACCAUUUUUGA 3'

In the polypeptide produced, what amino acid will be attached to the amino group of the
histidine encoded by this mRNA (use genetic code)?



A. Aspartic acid (Asp)

B. Proline (Pro)
C. Serine (Ser)

D. Phenylalanine (Phe)
E. Tyrosine (Tyr) - CORRECT ANSWER: A. Aspartic acid (Asp)



A portion of one strand of DNA has the sequence

5' AATGGCTTA 3'

What is the sequence of the other strand?


A. 3' TTACCGAAT 5'

B. 5' TAAGCCATT 3'

C. 3' AATGGCTTA 5'

D. 5' AATGGCTTA 3' - CORRECT ANSWER: A. 3' TTACCGAAT 5' and

B. 5' TAAGCCATT 3'


A sample of double-stranded DNA was found to contain 17% guanine nucleotides. What
percentage of adenine nucleotides would be found in this sample?


A. 17%

B. 33%

C. 34%
D. 66%

, E. It depends on the sequence - CORRECT ANSWER: B. 33%



According to this law, the inheritance of one gene does not affect the inheritance of the
second gene.



A. Law of Segregation

B. Mendelian Law
C. Law of Independent Assortment

D. Law of Unique Inheritance - CORRECT ANSWER: C. Law of Independent
Assortment



All cells in the human body are constantly replicating.



A. True

B. False - CORRECT ANSWER: B. False


An mRNA has the sequence:

5' AUGCCAUUGUCCGU 3'

What is the template DNA strand for this sequence?


A. 5' ATGCCATTGTCCGG 3'

B. 5' TACGGTAACAGGCC 3'

C. 5' ACGGACAATGGCAT 3'

D. 5' TUCGGTUUCUGGCC 3'
E. 5' GGCCUGUUACCGUA 3' - CORRECT ANSWER: C. 5'ACGGACAATGGCAT3'



At which points in the cell cycle do you not see chromosomes, but only uncondensed
DNA?