Mirabilis jalapa shows

• codominance

• incomplete dominance

• dominance

• complementary genes

Which of the following is not related to sex chromosome X or Y?

• Turner's syndrome

• Klinefelter's syndrome

• Down's syndrome

• Haemophilia and colour bindness

A normal woman is married with a man having hypertrichosis condition. They got one daughter and one son. What is the possibility of this daughter to have hypertrichosis condition?

• 0%

• 25%

• 50%

• 100%

A woman has a haemophilic son and three normal children. Her genotype and that of her husband with respect to this gene would be

• XX and X^hY

• X^hX^h and X^hY

• X^hX^h and XY

• X^hX and XY

The trisomy for 21^st chromosome is called

• Down's syndrome

• Turner's syndrome

• Sickle cell anaemia

• Klinefelter's syndrome

Which of the following is a test cross ?

• Tt x tt

• TT x tt

• Tt x Tt

• tt x tt

247.

1 : 2 : 1 phenotypic and genotypic ratio is found in

• complementary genes

• blending inheritance

• multiple alleles

• pseudo alleles

Tay Sach's disease is due to

• sex linked recessive gene

• sex linked dominant gene

• autosomal dominant gene

• autosomal recessive gene

Autosomes in humans are

• 11 pairs

• 22 pairs

• 23 pairs

• 43 pairs

A colourblind mother and normal father would have

• colourblind sons and normal/carrier daughters

• colourblind sons and daughters

• all colourblind

• all normal