MCQ
After fertilization the outer integument forms
- ✓Testa
- BTegmen
- CPerisperm
- DPericarp
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$I.$ Haemophilia is a sex-linked recessive disease
$II.$ Down's syndrome is due to aneuploidy
$III.$ Phenylketonuria is an autosomal dominant gene disorder
$IV.$ Phenylketonuria is an autosomal recessive gene disorder
$V.$ Sickle cell anaemia is an $X$-linked recessive gene disorder
Reason : If several spermatozoa hit the egg at same time, all can enter the egg.