RC2 STAAR 2022

This category is all about genetics. DNA, inheritance, and Meiosis! ​

RC 2

2022 STAAR

Multiple Choice

5 Which of these shows an example of an insertion mutation?

• a

• b

• c

• d

Multiple Choice

9. A model of the genetic control of coat color in rabbits is shown.

Allele Phenotype Inheritance

Which Punnett square represents a cross that would produce

albino offspring?

• a

• b

• c

• d

Multiple Choice

16. A model of transcription and a codon chart are shown.

Which amino acid would be coded first from the DNA strand

being transcribed?

• F Cys

• G Phe

• H Ile

• J Met

Multiple Choice

18. A cellular process is shown.

Which of these is the most likely result of the process shown in

the diagram?

• F Chromosome replication will cease to avoid errors that result

  in mutations.

• G Offspring will no longer express traits from previous generations.

• H Gametes will contain new allele combinations.

• J Chromatids will have less genetic variety.

Multiple Choice

20. What components make up the backbone of a DNA molecule?

• F Purines and deoxyribose

• G Pyrimidines and purines

• H Deoxyribose and phosphate groups

• J Phosphate groups and pyrimidines

Multiple Choice

23. Which statement best describes a similarity among trees, cats,

and amoebas?

• A They are prokaryotic organisms.

• B They are classified as members of the same kingdom.

• C They have genomes that consist of the same number of genes.

• D They contain DNA composed of the same four types of nucleotides.

Multiple Choice

28. A model of DNA is shown.

Which part of the DNA model is most directly associated with the

coding of genetic information?

Multiple Choice

30. In domesticated dogs, hair type is controlled by two different alleles.

The allele for wire hair is (H) and the allele for smooth hair is (h).

When two heterozygous dogs are crossed, what percentage of the

offspring is expected to be homozygous for smooth hair?

• a. 0%

• b. 25%

• c. 50%

• d. 75%

Multiple Choice

34. Which statements explain how a mutation in a somatic cell is different

from a mutation that occurs in gametes?

• F Somatic cell mutations occur in cells that give rise to gametes.

  Gamete mutations occur in cells that result in apoptosis.

• G Somatic cell mutations are maintained in the gene pool.

  Gamete mutations are expelled from the gene pool.

• H Somatic cell mutations are generally not passed to offspring.

  Gamete mutations are usually passed to offspring.

• J Somatic cell mutations will not be expressed by the individual that

  contains the mutation.

  Gamete mutations will be expressed by the individual.

Multiple Choice

48. E. coli has three genes that each code for different enzymes that

break down lactose. Scientists conducted investigations about the

production of these enzymes using samples of E. coli. Their results are

shown in the table.

Which conclusion about the production of the enzymes can be

determined by analyzing the scientists’ results?

• F Gene expression for the enzymes was controlled by the

  temperature of lactose.

• G The genes for the enzymes were expressed in equal amounts

  during both experiments.

• H Gene expression for the enzymes was controlled by the presence

  of lactose.

• J The genes for the enzymes were mutated before being expressed

  by the presence of lactose.