1. dizygotic twins
2. monozygotic twins
3. Both (a) and (b)
4. None of these
dizygotic twins
1. Typhlosole in earthworm, intestinal villi in rat and contractile vacuole in Amoeba
2. Nephridia in earth worm, Malpighian tubules in cockroach and urinary tubules in rat
3. Antennae of cockroach, tympanum of frog and clitellum of earthworm
4. Incisors of rat, gizzard of cockroach and tube feet of star fish
Nephridia in earth worm, Malpighian tubules in cockroach and urinary tubules in rat
1. sex reversal
2. transformer gene
3. hormonal control of sex
4. Both (a) and (c)
Both (a) and (c)
1. AIDS
2. Turner’s syndrome
3. erythroblastosis foetalis
4. sickle-cell anaemia
erythroblastosis foetalis
1. Ammonotelic
2. Uretelic
3. Uricotelic
4. None of these
Ammonotelic
1. dizygotic
2. polyzygotic
3. monozygotic
4. amphizygotic
monozygotic
1. Renal arteries
2. Renal vein
3. Aortic arteries
4. Vena cava
Renal vein
1. two ova are fertilized
2. one sperm fertilized two ova
3. one ovum is fertilized by two sperms
4. one fertilized ovum divides into two blastomeres and both of them separate
one fertilized ovum divides into two blastomeres and both of them separate
1. two sperms fertilize four ova
2. two sperms fertilize two ova
3. two sperms fertilize single ovum from two sites
4. None of the above
two sperms fertilize two ova
1. birds
2. Drosophila
3. cattle
4. human beings
cattle