Principles of I...

A sex linked disorder is

A colour blind man marries a woman with normal sight who has no history of colour blindness in her family. What is the probability of their grandson becoming colour blind?

Which of this following statement is true or false?

Statement A: Down’s syndrome is 44 Autosomes + XO.

Statement B: Klinefelter’s syndrome is 44 Autosomes + XXY.

Statement C: Erythroblastosis foetalis is X-linked chromosomes.

Statement D: Colour blindness is Y-linked chromosomes.

Which condition of zygote cell will lead to birth of a normal human female child

If both the parents are carriers of autosomal recessive disorder thalassemia, what are the chances of pregnancy resulting in an affected child

Assertion: Only a boy child could be born with the substitution of glutamtic acid by valine   on 6th position of β – chain of hemoglobin.

Reason: The gene for the above mutation occurs in Y- chromosome.

(A) If both Assertion and Reason are true and R is correct explanations of A

(B) If both Assertion and Reason are true and R is not the correct explanations of A

(C) If Assertion is true but Reason is false

(D) If both Assertion and Reason are false

Assertion: HbS Hb^SC, is homozygous condition of sickle cell anemia.

Reason: It occurs due to substitution of glutamtic acid by valine at 6th position of β – chain of hemoglobin.

(A) If both Assertion and Reason are true and R is correct explanations of A

(B) If both Assertion and Reason are true and R is not the correct explanations of A

(C) If Assertion is true but Reason is false

(D) If both Assertion and Reason are false

Human blood grouping is called ABO instead ABC because O signifies