Genetic Quiz 6/2 2567-2

A person with B+ blood type CANNOT receive blood from……….

• O-

• AB-

• B-

• O+

Consider these molecules. Which is/are the product(s) of translation?

• I & II

• I & III

• II & III

• II only

Which is correct? (9Saman 2564)

• Ribosomes translate mRNA in the 3′ to 5' direction.

• mRNA is made up of four bases: ATGC.

• The ratio of A + G to U + C in mRNA is always 1:1.

• In eukaryotes, the length of mRNA has been found to be less than the length of a gene.

• In prokaryotes, translation occurs after transcription is complete.

Answer explanation

• Ribosomes translate mRNA in the 3′ to 5′ direction. (Incorrect) - 5′ to 3′ direction

• mRNA is made up of four bases: ATG and C.

  • (Incorrect) - AUGC

• The ratio of A + G to U + C in mRNA is always 1:1. (Incorrect:) - Ratio varies

• In eukaryotes, the length of mRNA has been found to be less than the length of a gene. (Correct)

• In prokaryotes, translation occurs after transcription is complete. (Incorrect) - In prokaryotes, translation starts before transcription is complete.

• The likelihood of two alleles being inherited together decreases when they are located on different chromosomes, due to the process of __________ assortment.

Answer explanation

Law of segregation - กฎแห่งการแยก

Law of independent assortment - กฎแห่งการรวมกลุ่มอย่างอิสระ

Match the following

• tRNA

• Part Y of the figure is...

• codons

• The structure in the figure can be found in...

• a hydrogen bond

• Part Z of the figure binds to...

• a large subunit of ribosome

• Part X of the figure binds to...

• an amino acid

• The structure in the figure depicts...

Which statement accurately describes transcription and translation for protein synthesis? (TCAS A-Level 2565)

• 1. Transcription occurs in the cytoplasm in both prokaryotic and eukaryotic cells.

• 1. AUG is the start codon and is exclusively the first three bases at the 5' end of the mRNA strand.

• 1. A single mRNA strand can be used to synthesize multiple molecules of the same polypeptide.

• 1. The synthesis of mRNA involves the enzyme DNA polymerase, using a DNA strand as a template.

• 1. The synthesis of a polypeptide chain proceeds from the carboxyl terminus to the amino terminus of the polypeptide chain.

If the individual in Generation II, Person 4, is not a carrier of the disease, which of the following is the most likely pattern of genetic inheritance? (TCAS A-Level 2565)

• Y-linked

• X-linked dominant

• X-linked recessive

• autosomal dominant

• 1. autosomal recessive

40. Based on the research describing genetic inheritance characteristics of plants, it was found that there are two alleles related to the trait: allele A and allele a.

• Allele A is a dominant allele (purple flower) that controls the production of transcription factor A. Anthocyanin can be produced.

• Allele a (white flower) is a result of a mutation, causing the production of transcription factor A, inhibiting the production of anthocyanin.

From this information, which of the following statements is NOT correct? (9Saman 2564)

• 1. Plants with white flowers produce less transcription factor A.

• 1. Plants with white flowers undergo transcription and translation of allele a.

• 1. Plants with purple flowers have transcription factor A and synthesize anthocyanin pigments.

• 1. Plants with purple flowers undergo transcription and translation, leading to functional transcription factor A.

• 1. Plants with a genotype of heterozygous Aa have transcription factor A that functions normally and produces pigments.

9Saman2563

• 1

• 2

• 3

• 4

• 5

There are 5000 individuals in a pea population. Of these, 4,400 have round seeds, while the others have wrinkled seeds. This population has a heterozygous frequency of 0.36. Allele Y (round seed) has a complete dominant over allele y (wrinkled seed). If this population is in Hardy-Weinberg equilibrium, which choice is TRUE? (TCAS A-Level 2566)

• Y frequency is 0.52.

• 800 individuals are homozygous dominant.

• If, in the future, the wrinkled phenotype suffers a disease, YY will be more than 0.52.

• There is no correct answer.

Answer explanation