What would be the ratio of chromosome number between an egg and its zygote? How is the sperm genetically different from the egg?

• A
  $1$:$2$,Sperm has $X$ or $Y$ chromosome while egg has $X$
• B
  $2$:$1$,Sperm has $X$ or $Y$ chromosome while egg has $X$
• C
  $1$:$1$,Sperm has $X$ or $Y$ chromosome while egg has $Y$
• D
  $1$:$2$,Sperm has $X$ chromosome while egg has $Y$