Choose the correct answer:
  
1. Which of the following statements is incorrect?

2. Read the following four statements about the chromosomes found in humans, have mistakes in two of them, find out it

a. A male sperm cell contains approximately half 50% of the Y sperm cells
b. Males have two longer X chromosomes
c. In females, same type of gametes is formed.
d. Males produce three types of gametes, one with the X chromosome and the other with the XY chromosome