3.20a and b Pedigree diagrams

3.21b Genetic Probabilities

3.21a Genetic Probabilities

3.18c Codominance

codominance is when both genotypes contribute to the phenotype.

e.g. 

allele key :

blue flower : BB

white flower : WW

BB + WW = BW(orange flower)

3.19 a and b

3.18 a and b

3.12 amniotic fluid

the developing embryo is protected by the amniotic fluid 

within the uterus, surrounding the embryo is a fluid called the amniotic fluid

one of the functions of the amniotic fluid is to protect the embryo, this is possible because the fluid is made largely of water which cannot be compressed

the fluid absorbs any pressure on the outside wall of the uterus preventing damage to the unborn child 

(it is hard to create great force within water)