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.

This ICSE Class 10 Biology practice quiz has 51 multiple-choice questions on Genetics – Fundamentals, and 51 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.

Sample questions

1. In Mendel's experiments, what is the term used to describe the observable characteristics of an organism, such as flower color or seed shape?

   1. Genotype
   2. Allele
   3. Phenotype
   4. 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.

2. What phenomenon describes the situation where one gene influences multiple phenotypic traits?

   1. Epistasis
   2. Pleiotropy
   3. Codominance
   4. Incomplete dominance
   Show answer

   Answer: B. Pleiotropy

   Pleiotropy is when a single gene affects multiple, often unrelated, phenotypic traits.

3. What is the term for genes located on the same chromosome that are inherited together?

   1. Independent genes
   2. Linked genes
   3. Allelic genes
   4. 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.

4. A recessive allele is one that:

   1. Is always present in the population
   2. Only expresses its phenotype when in the homozygous state
   3. Masks the expression of a dominant allele
   4. 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.

5. Which of the following describes the genetic material contained within a chromosome?

   1. A single gene
   2. A single allele
   3. DNA
   4. A protein
   Show answer

   Answer: C. DNA

   Chromosomes are structures made of DNA tightly coiled around proteins. DNA carries the genetic information.

More questions in this quiz

Answers and explanations are in the full quiz.

1. If an organism is heterozygous for a particular trait, it possesses:
2. Which of the following represents the genetic makeup of an organism for a specific trait?
3. During meiosis, homologous chromosomes separate during which phase?
4. A test cross is performed to determine the genotype of an individual exhibiting a dominant phenotype. This individual is crossed with:
5. The Law of Segregation, as proposed by Mendel, states that:
6. If a trait is expressed only when an individual is homozygous for the recessive allele, what is the genotype of an individual who does not express the trait but is a carrier?
7. Crossing over, a process that exchanges genetic material between non-sister chromatids of homologous chromosomes, occurs during:
8. What is the probability of obtaining a homozygous recessive offspring (aa) from a cross between two heterozygous parents (Aa x Aa)?
9. In humans, the sex chromosomes for a male are typically represented as:
10. If a gene has multiple alleles, it means that:
11. Which of Mendel's laws states that alleles of different genes assort independently of each other during gamete formation?
12. In a dihybrid cross, if the parents are both heterozygous for two traits (e.g., RrYy x RrYy), what is the expected phenotypic ratio of offspring assuming complete dominance for both traits and independent assortment?
13. What is an allele?
14. If a dominant allele is represented by 'A' and a recessive allele by 'a', an individual with the genotype 'Aa' will exhibit:
15. Which of the following is an example of incomplete dominance?
16. A segment of DNA that contains the instructions for building a specific protein or functional RNA molecule is called a:
17. When an organism has two different alleles for a trait, the trait expressed is determined by the allele that is:
18. Meiosis is a type of cell division that results in:
19. If a plant breeder crosses a homozygous tall pea plant (TT) with a homozygous dwarf pea plant (tt), what will be the genotype of the F1 generation?
20. Which of the following blood types is considered a universal donor for red blood cells?
21. What is the primary role of DNA in genetics?
22. In codominance, what is observed in the heterozygous phenotype?
23. The specific sequence of nucleotides in DNA that determines a particular trait is called a:
24. What is the term for a mutation that occurs in a somatic cell and is not passed on to offspring?
25. If an individual has genotype AA, what is their phenotype likely to be, assuming A is a dominant allele?
26. Which of the following is NOT a consequence of independent assortment during meiosis?
27. The ABO blood group system in humans is an example of which type of inheritance?
28. What is the process by which genetic material is exchanged between non-sister chromatids of homologous chromosomes?
29. If two genes are linked, they are likely to be:
30. Which of the following represents a heterozygous genotype for a trait where alleles are represented by 'P' and 'p'?
31. When a trait is determined by multiple genes, this phenomenon is called:
32. The location of a gene on a chromosome is called its:
33. Which of the following is a sex-linked trait in humans?
34. In a monohybrid cross between two heterozygous parents (Aa x Aa), what is the genotypic ratio of the offspring?
35. What type of cell division is responsible for the production of gametes (sperm and egg cells)?
36. If a trait is caused by a dominant allele, and an individual inherits at least one copy of this allele, they will express the trait. What would be the genotype(s) of individuals expressing this dominant trait?
37. The observable characteristics of an organism, resulting from the interaction of its genotype and the environment, are known as its:
38. A mutation in a gene that changes an amino acid in a protein is called a:
39. Which of the following events ensures genetic diversity in sexually reproducing organisms?
40. If a person has blood type AB, what antibodies are present in their plasma?
41. What is the term for genes that are located on the same chromosome?
42. Which of the following describes a situation where both alleles of a gene pair are fully and equally expressed in the phenotype of a heterozygote?
43. In a typical human karyotype, the total number of chromosomes is:
44. What is the study of heredity and the variation of inherited characteristics called?
45. If a homozygous dominant individual (AA) is crossed with a homozygous recessive individual (aa), all offspring in the F1 generation will have the genotype:
46. Which of the following terms describes a pair of genes where one allele is dominant and the other is recessive?

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