Which symbol is used in pedigree analysis to represent a carrier offspring?

Which of the following genotypes causes sickle cell anemia?

Quantitative defect of hemoglobin $- P$
Qualitative defect of hemoglobin $- Q$
Select the correct option for $P$ and $Q$.
$\quad \quad P\quad \quad \quad Q$

$A$ son of a colourblind father and a normal homozygous mother marries a daughter of a normal father and a heterozygous (carrier) mother. What will be the phenotype of their children?

In pedigree analysis,the symbol $ʘ$ is used for:

$A$ normal woman whose father was albino marries a man who is albino. What proportion of normal and albino can be expected among their offspring?