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Biology Cumulative Actual Exam | Questions and Answers Latest Update 2025
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Biology Cumulative Actual Exam | Questions and Answers Latest Update 2025
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Biology Cumulative Actual Exam | Questions andAnswers Latest Update 2025
Which of the following statement about incomplete dominance and codominance is true? -
✔✔In codominance, both phenotypes are expressed in the heterozygote; in incomplete
dominance, the heterozygote shows a phenotype that is intermediate between the two
homozygotes
When two different alleles of a gene are both fully expressed in a heterozygote, but neither
allele is dominant over the other, it is called _________. - ✔✔codominance
A breeder of Cochin chickens breeds a group of white-feathered hens with a black-feathered
rooster. The resulting chicks all develop gray feathers. If feather color is controlled by a single
pair of genes, which of the following statements most likely describes the genetics involved? -
✔✔The black and white alleles are incompletely dominant
The result of a cross between two different incompletely dominant alleles is likely to be
________. - ✔✔an intermediate phenotype (Snapdragon flower color shows incomplete
dominance)
In a family of four children, one has Type O blood, one has Type AB blood, one has Type B
blood, and one Type A blood. What are the possible genotypes of the parents? - ✔✔IBi and
IAi
True or false: Traits such as skin color and height are said to be pleiotropic, which means that
many genes determine the phenotype of the trait. - ✔✔False; pleiotropy occurs when one
gene has multiple effects such as skin color
A male family member is affected by hemophilia. On his family's pedigree chart, he would be
represented by a(n) ________. - ✔✔shaded square
, During gel electrophoresis, DNA fragments are separated from each other based on ________. -
✔✔the length of each fragment
What is the goal of the polymerase chain reaction (PCR)? - ✔✔to produce many copies of a
region of DNA and used to amplify a particular range of DNA.
Which of the following events occurs during transcription? - ✔✔A molecule of RNA is formed
based on the sequence of nucleotides in DNA. The message in the mRNA is translated into a
protein during the process of translation
What is true about mRNA? - ✔✔mRNA moves from the nucleus to the cytoplasm following
RNA processing. mRNA is transcribed from DNA in the nucleus, not in the cytoplasm.
The site of translation is - ✔✔ribosomes in the cell cytoplasm
Which one of the following does not play a role in translation? - ✔✔DNA. DNA contains the
instructions for making proteins, but these instructions are transcribed to RNA before
translation occurs.
Which of the following does not occur during RNA processing? - ✔✔mRNA attaches to the
small subunit of a ribosome
Which of the following would cause the process of transcription to stop? - ✔✔altered RNA
nucleotides that cannot be put together
Some cells can regulate the amount of gene product that is produced in a cell through the use
of repressors, which act on the process of ________. - ✔✔transcription
Which of the following statements about recombinant DNA molecules is true? -
✔✔Recombinant DNA molecules contain DNA from more than one organism
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