Biology MCQs about genetics:

1. What is the basic unit of heredity?

A) Chromosome
B) Gene
C) DNA
D) RNA 

   Answer: B) Gene

2. Which of the following structures carries genetic information?

A) Ribosome
B) Chromosome
C) Endoplasmic reticulum
D) Golgi apparatus 

   Answer: B) Chromosome

3. What is the term for different forms of a gene?

A) Alleles
B) Genotypes
C) Phenotypes
D) Chromatids 

   Answer: A) Alleles

4. In Mendelian genetics, what is the expected phenotypic ratio for a monohybrid cross?

A) 1:1
B) 3:1
C) 9:3:3:1
D) 1:2:1 

   Answer: B) 3:1

5. What is the function of messenger RNA (mRNA)?
 
A) To replicate DNA
B) To transport amino acids
C) To carry genetic information from DNA to the ribosome
D) To form the structure of ribosomes 

   Answer: C) To carry genetic information from DNA to the ribosome

6. Which of the following is a type of mutation?

   A) Insertion
   B) Deletion
   C) Substitution
   D) All of the above 

   Answer: D) All of the above

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