Select the correct answer:
  
1. Read the given statements and select the incorrect one.

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