GCS Grade 7 Science Practice Questions Punnett Squares, Genetic Variation, and Pedigrees

1. Which of the following influences a phenotype?

• A. always genotype alone
• B. always genotype and environment
• C. always environment alone
• D. sometimes genotype and environment

2. Use the picture below to answer the question. A cross between two brown eyed parents is shown above. Which statement BEST explains why blue eyes appear only in 25% of offspring?

• A. It is a mutated trait.
• B. It is a recessive trait.
• C. It is a dominant trait.
• D. It is an acquired trait.

3. Of sixteen rabbits just born, thirteen have brown fur and three have white fur. The trait for white fur is considered to be ______________.

• A. recessive
• B. bossy
• C. stronger
• D. dominant

4. Who is the Austrian monk whose work with pea plants helped him come up with a theory of heredity?

• A. Gregor Mendel
• B. Charles Darwin
• C. Robert Hooke
• D. Rudolph Virchow

5. Which term correctly describes an individual with a pair of the same alleles for a trait?

• A. homologus
• B. heterologus
• C. homozygous
• D. heterozygous

6. Which of these terms describes the genetic information that is passed from parents to offspring?

• A. genotype
• B. phenotype
• C. phenocopy
• D. trait

7. Look at the Punnett square below. If the two parents represented in the Punnett square have four offspring, what does the Punnett square tells you?

• A. Two of the offspring will definitely have the genotype Aa.
• B. It is more likely that two of them will have the genotype Aa than the genotype aa.
• C. There is a 50% chance for each of the four offspring to have the genotype Aa.
• D. It is less likely that two of them will have the genotype Aa than the genotype aa.

8. What are the possible genotypes of the offspring represented in this Punnett square below?

• A. AA and aa
• B. AA and Aa
• C. Aa and Aa
• D. Aa and aa

9. An individual with two different alleles for a specific trait is said to be:

• A. homozygous
• B. heterozygous
• C. homogeneous
• D. heterogeneous

10. Genes have different versions. Which term is the name of a gene's version?

• A. genotype
• B. phenotype
• C. phenocopy
• D. allele