Genetics Unit Pre-assessment (Grade 8)

12 Questions | By Tagscience | Updated: Mar 21, 2022 | Attempts: 762

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Genetics Unit Pre-assessment (Grade 8) - Quiz

Are you an 8th grader and have just gotten introduced to all things genetics? One thing you should know is how traits are passed from parents to offspring. If so then the genetics unit pre-assessment quiz below is exactly what you need to ensure that you have understood all you covered so far. Do give it a try and see how well you will do. All the best!

Questions and Answers

1.

A(n) is a segment of DNA that carries the instructions for producing a specific trait (Intermediate Core Curriculum 2.2a)
- A.
  
  Chromosome
- B.
  
  Karyotype
- C.
  
  Enzyme
- D.
  
  Gamete
- E.
  
  Gene
2.

Kernel corn is a trait determined by two alleles. The dominant allele (P) produces a purple color and the recessive allele (p) produces a yellow color. The diagram below shows an ear of corn produced by crossing two corn plants. The shaded kernels are purple and the unshaded ones are yellow. The yellow corn kernels can best be described as (Intermediate Core Curriculum 2.2b).
- A.
  
  Homozygous dominant
- B.
  
  Hybrid
- C.
  
  Heterozygous
- D.
  
  Homozygous recessive
- E.
  
  Codominant
3.

Pea plants come in two sizes – tall plants and dwarf plants. The dominant allele (T) produces tall pea plants, and the recessive allele (t) produces dwarf pea plants. The Punnett Square below shows a cross between tall and dwarf pea plants. What is the probability that the offspring of this cross are homozygous recessive (Intermediate Core Curriculum 2.2c).
- A.
  
  0%
- B.
  
  25%
- C.
  
  50%
- D.
  
  75%
- E.
  
  100%
4.

Below is a pedigree for an inherited heart disease. What is the probability that their child F would have the inherited heart disease (Intermediate Core Curriculum 2.2c)?
- A.
  
  0%
- B.
  
  25%
- C.
  
  50%
- D.
  
  75%
- E.
  
  100%
5.

Which of the following is an example of how genes can be modified by the environment (Standard 2.1a)?
- A.
  
  Pleiotropy (You may inherit a gene for the complex of symptoms that are collectively called sickle-cell anemia).
- B.
  
  Incomplete Penetrance (You may inherit the gene for diabetes but never get the disease unless you become overweight)
- C.
  
  Epistasis (Your dog inherits a dominant allele that determines whether the fur will have dark pigment and a different allele that determines how dark the pigment will be)
- D.
  
  Polygenic Traits (You inherit many different genes which combined effects determines your skin color).
- E.
  
  Codominance (A cow inherits two alleles that make a positive contribution to the phenotype resulting in a black and white coat).
6.

Which statement describes the work of Gregor Mendel (Standard 2.1a)?
- A.
  
  He developed some basic principles of heredity without having knowledge of chromosomes.
- B.
  
  He developed the microscope for the study of genes in pea plants.
- C.
  
  He explained the principle of dominance on the basis of the gene-chromosome theory.
- D.
  
  He used his knowledge of gene mutations to help explain the appearance of new traits in organisms.
- E.
  
  He studied the beaks of finches which helped him to develop the theory of evolution by natural selection.
7.

Some individuals with blood group A may inherit the genes for dimples, while other individuals with blood group A may inherit the genes for no dimples. This can best be explained by the principle of (Standard 2.1b)?
- A.
  
  Dominance
- B.
  
  Multiple alleles
- C.
  
  Independent assortment
- D.
  
  Incomplete dominance
- E.
  
  Segregation
8.

Chromosomes normally occur as homologous pairs in (Standard 2.1c):
- A.
  
  A sperm cell
- B.
  
  An egg cell
- C.
  
  A zygote
- D.
  
  A gamete
- E.
  
  A haploid cell
9.

Which of the following statements is true (Standard 2.1c)?
- A.
  
  Chromosome map percentages are not actual chromosome distances, but represent the relative position of genes.
- B.
  
  Gene linkage is an exception to Mendel’s Law of Dominance Genetic recombination involves both gene linkage and chromosome mapping.
- C.
  
  Polyploid plants are avoided by plant growers because they are almost always lethal.
- D.
  
  Each somatic cell in the human body has a different number of chromosomes depending on the function of the cell.
- E.
  
  Genetic recombination involves both gene linkage and chromosome mapping.
10.

Breeders have developed a variety of chicken that has no feathers. Which methods were most likely used to produce this variety (Standard 2.2a)?
- A.
  
  Artificial selection and inbreeding
- B.
  
  Grafting and hybridization
- C.
  
  Regeneration and incubation
- D.
  
  Vegetative propagation and binary fission
- E.
  
  Test cross and polyploidy
11.

Rate, on a scale of 1 – 4, 1 being the lowest and 4 being the highest, how much you already know about genetics.
12.

Rate, on a scale of 1 – 4, 1 being the lowest and 4 being the highest, how interested are you in genetics.