The expected phenotype ratio is 9:3:3:1 for a BbFf x BbFf cross.
Explanation:
Data given:
Black fur dominant = BB, short fur dominant FF
brown fur recessive = bb, long fur ff
genotype of parents:
BbFf and BbFf
The cross between these two genotype of parents is shown in the below punnet square:
BF Bf bF bf
BF BBFF BBFf BbFF BbFf
Bf BBFf BBff BbFf Bbff
bF BbFF BbFf bbFF bbFf
bf BbFf Bbff bbFf bbff
phenotype ratio:
black fur and short guinea pig = 9
black and long fur = 3
brown and long fur = 3
brown and short fur-1
The expected phenotypic ratio is 9:3:3:1
This belief is called the hygiene hypothesis which is not completely valid and tested as truth and applicable to all cases. This states that once a child is exposed more to viruses and bacteria, the child becomes immune to sicknesses. Of course, this takes all the factors to play to determine the index of a child's immunity to illnesses.
Answer:
As part of the phosphate group, it is a component of DNA, RNA, ATP (adenosine triphosphate), and the phospholipids that form all cell membranes.
