321.

One of the following is sex-influenced character

• Appearance of beard

• Baldness in male

• Docile behaviour of female

• Low BMR in female

A person with the sex chromosomes XXY suffers from :

• Down's syndrome

• Turner's syndrome

• Gynandromorphism

• Klinefelter's syndrome

Which of the following represents Klinefelter's syndrome?

• XX

• XO

• XY

• XXY

Which one of the following conditions in chromosome number is called monosomy?

• 2n + 1

• 2n + 2

• 2n - 1

• 2n - 2

Down's syndrome occurs as a result of

• trisomy

• tetrasomy

• autopolyploidy

• allopolyploidy

Indicate, the inheritance of which of the following is controlled by multiple alleles?

• Colourblindness

• Sickle cell anaemia

• Blood group

• Phenylketoneuria

Which of the following conditions is related to haemophilia?

• A responsible recessive gene present in the X-chromosome

• A responsible dominant gene presentin the X-chromosome

• A responsible dominant gene present in the Y-chromosome

• A responsible dominant gene present in the autosomal chromosome

The absence of which clotting factor leads to haemophilia-A?

• Factor VII

• Factor VIII

• Factor IX

• Factor X

A character, which is expressed in a hybrid is called

• dominant

• co-dominant

• recessive

• epistaticn

Which of the following is correct

• Haemophilic-Y-chromosome

• Down's syndrome-21' chromosome

• Sickle cell anaemiaX-chromosome

• Parkinson's disease-X and Y-chromosome