Understanding Genetics in Biology
Science
General
10 questions
~20 mins
1 views0 downloads
About This Worksheet
A medium difficulty Science worksheet on genetics basics for grade 7 students. Includes questions on Genetics Basics, Inheritance and Traits, Genetic Variations and Mutations.
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Understanding Genetics in Biology
Subject: ScienceGrade: General
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Understanding Genetics in Biology
Instructions: Answer all questions carefully. For multiple choice questions, select the best option. For short answer questions, write your answer clearly in the space provided.
A
Genetics Basics
Questions about fundamental genetics concepts.
1.
What is the molecule that carries genetic information in most living organisms?
[1 mark]AProtein
BCarbohydrate
CLipids
DDNA
2.
Briefly explain what a gene is.
[2 marks]3.
Which of the following best describes dominant alleles?
[1 mark]AOnly expressed when present in two copies
BAlways masked by recessive alleles
CAre only found in males
DExpressed when at least one copy is present
4.
What is the term for the physical expression of a gene?
[1 mark]B
Inheritance and Traits
Questions about how traits are inherited from parents.
1.
If a heterozygous individual has the genotype Tt for a trait, what is the dominant allele?
[1 mark]2.
In a Punnett square, if a tall plant (Tt) is crossed with a short plant (tt), what is the probability of getting a tall plant?
[1 mark]A25%
B50%
C75%
D100%
3.
Define what a recessive allele is.
[2 marks]4.
What is the phenotype ratio in a monohybrid cross between two heterozygous individuals (Tt x Tt)?
[1 mark]A3:1
B1:1
C2:1
D1:2:1
C
Genetic Variations and Mutations
Questions about genetic changes and diversity.
1.
What is a mutation?
[2 marks]2.
Which of the following can cause mutations?
[1 mark]AAll of the above
BRadiation
CUV light
DChemicals
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Details
- Created
- 5/10/2025
- Updated
- 12/31/2025
- Type
- worksheet