Class 10 Science Heredity

Class 10 Science Heredity

 

Class 10 Science Heredity Fill in the blanks , Multiple Choice Question [mcq] and True false .

 

Fill in the Blanks

1. The process by which traits are passed from parents to offspring is called ________. Answer: Heredity

2. Variations are maximised in ________ reproduction. Answer: sexual

3. Mendel used ________ plants for his experiments on inheritance. Answer: pea

4. A trait that is expressed even when present in a single copy is called a ________ trait. Answer: dominant

5. The genetic makeup of an organism is called its ________. Answer: genotype

6. The physical expression of a trait is called its ________. Answer: phenotype

7. In humans, females have the sex chromosomes ________. Answer: XX

8. In humans, males have the sex chromosomes ________. Answer: XY

9. The F1 generation in Mendel’s experiments showed only the ________ trait.
Answer: dominant

10. The ratio of dominant to recessive traits in the F2 generation of a monohybrid cross is ________. Answer: 3:1

11. A section of DNA that codes for a protein is called a ________. Answer: gene

12. The process by which germ cells reduce their chromosome number by half is called ________. Answer: meiosis

13. The inheritance of one trait does not affect the inheritance of another trait, as per Mendel’s law of ________. Answer: independent assortment

14. In humans, the sex of the child is determined by the ________ chromosome contributed by the father. Answer: Y

15. Asexual reproduction leads to ________ variations compared to sexual reproduction. Answer: fewer

 

Class 10 Science Heredity Multiple Choice Questions

 

1. What is the main cause of variation in asexual reproduction?
(a) DNA copying errors
(b) Environmental factors
(c) Crossing over
(d) Mutation
Answer: (a) DNA copying errors

 

2. Which of the following is a recessive trait in pea plants?
(a) Tallness
(b) Round seeds
(c) Violet flowers
(d) Wrinkled seeds
Answer: (d) Wrinkled seeds

 

3. If a tall (Tt) pea plant is crossed with a short (tt) pea plant, what percentage of offspring will be tall?
(a) 25%
(b) 50%
(c) 75%
(d) 100%
Answer: (b) 50%

 

4. Which law of Mendel states that traits are inherited independently of each other?
(a) Law of Dominance
(b) Law of Segregation
(c) Law of Independent Assortment
(d) Law of Inheritance
Answer: (c) Law of Independent Assortment

 

5. In humans, a child will be male if he inherits which chromosome from his father?
(a) X
(b) Y
(c) XX
(d) XY
Answer: (b) Y

 

6. What is the genotypic ratio in the F2 generation of a monohybrid cross?
(a) 3:1
(b) 1:2:1
(c) 9:3:3:1
(d) 1:1
Answer: (b) 1:2:1

 

7. Which of the following is NOT a Mendelian trait in pea plants?
(a) Seed colour
(b) Flower position
(c) Blood group
(d) Pod shape
Answer: (c) Blood group