Question

explain why in some families, all children are of the same sex​

Answer 1

Answer:

Because their families have the same chromosomes{x for mother & x,y for father}.

Answer 2

Answer:

the mother gives out automatically the x chromosome, and the father can either give an x or y chromosome. some men more often give out more of a certain chromosome. the chromosome the father gives determines the gender of baby. x is girl and y is boy