the smiths have four chilkdren,all girls. thier fifth is a boy. why did this change occur?

Question

a)the conception classes taken by the parents.
b)the mother copntribution of a y chromosome
c)the fathers contribution of a y chromosome

Answer 1

I assume the Smiths are mammals (if they are birds, it is different).

See g2 on this link.

http://www.biol.andrews.edu/gen/l7.htm

Answer 2

THE SMITH HAVE FOUR CHILDREN,ALL GIRLS.THEIR FIFTH CHILD IS A BOY.WHY DID THIS CHANGE OCCUR?
A)THE CONCEPTION CLASSES TAKEN BY THE PARENTS
B)THE FATHERS CONTRIBUTION OF A Y CHROMOSOME.
C)THE MOTHERS CONTRIBUTION OF A Y CHROMOSOME.

Answer 3

the father contribution of a y chromosome