Genetics – Fundamentals Quiz - ICSE Class 10 Biology
Free practice quiz: Genetics – Fundamentals (ICSE Class 10 Biology). 51 multiple-choice questions with answers and explanations. Play online, no sign-up needed.
Play all 51 questions freeSample questions
In Mendel's experiments, what is the term used to describe the observable characteristics of an organism, such as flower color or seed shape?
- Genotype
- Allele
- Phenotype
- Homozygous
Show answer
Answer: C. Phenotype
The phenotype refers to the physical or observable traits of an organism, which are a result of the interaction between its genotype and the environment.
What phenomenon describes the situation where one gene influences multiple phenotypic traits?
- Epistasis
- Pleiotropy
- Codominance
- Incomplete dominance
Show answer
Answer: B. Pleiotropy
Pleiotropy is when a single gene affects multiple, often unrelated, phenotypic traits.
What is the term for genes located on the same chromosome that are inherited together?
- Independent genes
- Linked genes
- Allelic genes
- Dominant genes
Show answer
Answer: B. Linked genes
Linked genes are genes located on the same chromosome and tend to be inherited together, unless separated by crossing over.
A recessive allele is one that:
- Is always present in the population
- Only expresses its phenotype when in the homozygous state
- Masks the expression of a dominant allele
- Is always beneficial to the organism
Show answer
Answer: B. Only expresses its phenotype when in the homozygous state
A recessive allele only shows its phenotypic effect when an organism inherits two copies of it (homozygous recessive, e.g., 'aa'). In the presence of a dominant allele (heterozygous, e.g., 'Aa'), the dominant trait is expressed.
Which of the following describes the genetic material contained within a chromosome?
- A single gene
- A single allele
- DNA
- A protein
Show answer
Answer: C. DNA
Chromosomes are structures made of DNA tightly coiled around proteins. DNA carries the genetic information.