Heredity worksheet

 Here are 20 multiple-choice questions (MCQs) based on the topic of Heredity:

1. Who is known as the Father of Genetics? 

a) Charles Darwin

b) Gregor Mendel

c) Thomas Morgan

d) James Watson

2. What are the different forms of a gene called?

 a) Chromosomes

b) Alleles

c) Traits

d) Genotypes

3. Which law states that two alleles for a trait separate during the formation of gametes?

 a) Law of Dominance

b) Law of Segregation

c) Law of Independent Assortment

d) Law of Recombination

4. In a monohybrid cross between a tall plant (TT) and a short plant (tt), what is the genotype of the F1 generation?

 a) TT

b) Tt

c) tt

d) None of these

5. What is the phenotype of an organism with the genotype Tt, where T is dominant over t? 

a) Tall

b) Short

c) Medium height

d) Cannot be determined

6. Which chromosome combination determines a female in humans? 

a) XY

b) XX

c) YY

d) X

7. What is the phenotypic ratio in the F2 generation of a dihybrid cross between two heterozygous parents (RrYy)?

 a) 9:3:3:1

b) 3:1

c) 1:2:1

d) 1:1

8. In humans, what determines the sex of a child?

 a) Mother’s chromosome

b) Father’s chromosome

c) Both parents equally

d) Environment

9. What term describes when neither allele is completely dominant, resulting in a blend of traits? 

a) Codominance

b) Incomplete Dominance

c) Multiple Alleles

d) Independent Assortment

10. Which disorder is caused by a mutation in the hemoglobin gene? 

a) Down syndrome

b) Sickle Cell Anemia

c) Cystic Fibrosis

d) Hemophilia

11. What type of genetic disorder is cystic fibrosis? 

a) Dominant

b) Recessive

c) Sex-linked

d) Chromosomal

12. Who suggested that traits are inherited as discrete units?

 a) Charles Darwin

b) Gregor Mendel

c) Alfred Wallace

d) Carl Linnaeus

13. Which of the following is an example of a multiple allele trait?

 a) Eye color

b) Blood group

c) Height

d) Skin color

14. What is the genetic makeup of an organism called? 

a) Phenotype

b) Genotype

c) Trait

d) Chromosome

15. What is the physical expression of an organism’s genes called? 

a) Phenotype

b) Genotype

c) Allele

d) Dominance

16. If a person has one allele for brown eyes (B) and one for blue eyes (b), which color will their eyes be, assuming B is dominant? 

a) Blue

b) Brown

c) Green

d) Hazel

17. What is the ratio of offspring with a recessive phenotype in a monohybrid cross of two heterozygous parents? 

a) 1:1

b) 1:2:1

c) 3:1

d) 1:3

18. In the ABO blood group system, which blood type is considered the universal donor? a) A

b) B

c) AB

d) O

19. What structure carries genes within a cell? a) Ribosome

b) Nucleus

c) Chromosome

d) Mitochondria

20. Which law explains the independent inheritance of two different traits? 

a) Law of Dominance

b) Law of Segregation

c) Law of Independent Assortment

d) Law of Variation

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These MCQs cover various aspects of heredity

, including basic genetics, Mendelian laws, and disorders. Let me know if you need any additional questions or modifications!