What would be the ratio of chromosome number between an egg and its zygote? How is the sperm genetically different from the egg? Share with your friends Share 1 Bhavika Jangid answered this 1:2 Sperm has either X or Y chromosome where as egg has only X chomosome 3 View Full Answer Anu .... answered this The ratio is 1:2 1 Vaishnavi Kale answered this Ratio is 1:2 1