What is the chance that their tenth child be a girl

A family consisted of nine boys, including two sets of twin boys. Each pair of twins made a pitcher-catcher combination on a baseball team. The family would like to have a daughter. What is the chance that their tenth child will be a girl?
A) 25%
B) 50%
C)10%
D)(1/2) to the power of 10


2) the coat of a Labrador retrievers is detained by two alleles. The black allele B is dominate to the brow allele b. A second pair of alleles E and e affect the expression of the coat colour. The homozygous recessive condition, ee, prevents the expression of black or brown and produces a pup with a yellow coat.

Genotype.  Phenotype
 B_E_         Black
BbE_           Brown
_ee.             Yellow

If two Labrador retrievers with the genotype BbEe were crossed, what phenotypic ratio would be expected in their offspring?

_______:________:_____________
Black.      Brown.      Golden yellow