In human beings, at the end of 12 weeks (first trimester) of pregnancy, the following is observed:
| 1. | Eyelids and eyelashes are formed |
| 2. | Most of the major organ systems are formed |
| 3. | The head is covered with fine hair |
| 4. | Movement of the fetus |
Select the correct option of haploid cells from the following groups :
| 1. | Primary oocyte, Secondary oocyte, Spermatid |
| 2. | Secondary spermatocyte, First polar body, Ovum |
| 3. | Spermatogonia, Primary spermatocyte, Spermatid |
| 4. | Primary spermatocyte, Secondary spermatocyte, Second polar body |
Match the following columns and select the correct option:
| Column-I | Column-II | ||
| (a) | Ovary | (i) | Human chorionic gonadotropin |
| (b) | Placenta | (ii) | Estrogen & Progesterone |
| (c) | Corpus luteum | (iii) | Androgens |
| (d) | Leydig cells | (iv) | Progesterone only |
| Options: | (a) | (b) | (c) | (d) |
| 1. | (iv) | (iii) | (ii) | (i) |
| 2. | (i) | (ii) | (iii) | (iv) |
| 3. | (i) | (iii) | (ii) | (iv) |
| 4. | (ii) | (i) | (iv) | (iii) |
Progestogens alone or in combination with estrogens can be used as a contraceptive in the form of:
1. Implants only
2. Injections only
3. Pills, injections and implants
4. Pills only
Chromosomal theory of inheritance was proposed by:
| 1. | Sutton and Boveri | 2. | Bateson and Punnet |
| 3. | T. H. Morgan | 4. | Watson and Crick |
The number of contrasting characters studied by Mendel for his experiments was:
| 1. | 14 | 2. | 4 |
| 3. | 2 | 4. | 7 |
The best example of pleiotropy is:
| 1. | Skin color | 2. | Phenylketonuria |
| 3. | Colour Blindness | 4. | ABO Blood group |
The term 'Nuclein' for the genetic material was used by :
1. Franklin
2. Meischer
3. Chargaff
4. Mendel
In the polynucleotide chain of DNA, a nitrogenous base is linked to the –OH of:
| 1. | 2'C pentose sugar | 2. | 3'C pentose sugar |
| 3. | 5'C pentose sugar | 4. | 1'C pentose sugar |
E.coli has only 4.6 × base pairs and completes the process of replication within 18 minutes, then the average rate of polymerization is approximately:
| 1. | 2000 base pairs/second | 2. | 3000 base pairs/second |
| 3. | 4000 base pairs/second | 4. | 1000 base pairs/second |
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