Which one of the following statement are correct.

(i) Mendel’s experiments had small sample size which gave greater credibility to the data.

(ii) A true breeding line shows a stable trait inheritance and expression for several generations.

(iii) A recessive parental trait is expressed only in its heterozygous condition.

(iv) Failure of segregation of chromatids during cell division results in aneuploidy.

(v) Chromosomal disorders are mainly determined by alteration or mutation in a single gene.

(vi) Thalasemia and cystic fibrosis are Mendelian disorders.

(vii) Sickle-cell anemia is an X-lined trait.

(viii) In complete or mosaic inheritance is an example of pre-Mendelian concept of blending inheritance.

(ix) Test cross is a special type of back cross.

(x) Chromosomal aberrations are commonly observed in cancer cells.