Question
Dominant characters and Recessive characters.
| Dominant characters | Recessive characters |
| $1.$ The characters that are expressed in the $F_1$ generation are called dominant characters. | $1.$ The characters that are not expressed in the $F_1$ generation are called recessive characters. They are prevented from expressing themselves, due to presence of dominant allele. |
| $2.$ Dominant character is expressed either in homozygous or heterozygous combination. | $2.$ Recessive characters are expressed only when they are in homozygous combination. |
| $3.$ Dominant characters cannot be masked by recessive characters. E.g. Round seed and yellow seed are dominant characters in pea plant. |
$3.$ Recessive characters are masked by dominant characters. E.g. Wrinkled seed and green seed are recessive characters in pea plant. |
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| Column I | Column II |
| (1) Acrosome | (a) Completion of IInd meiotic division of secondary oocyte |
| (2) Penetration of sperm into ovum | (b) Dissolution of zona pellucida |
| (3) Formation of fertilization membrane | (c) Secretion of Hyaluronidase |
| (4) Acrosin / Zona lysine | (d) Prevention of polyspermy |
Explain the different factors responsible for genetic variations.
| Column I [Phases] | Column II [Hormonal changes] |
| (1) Menstrual phase | (a) Rapid secretion of LH |
| (2) Proliferative phase | (b) Increased level of FSH and estrogen |
| (3) Ovulatory phase | (c) Increased level of progesterone |
| (4) Secretory phase | (d) Decrease in progesterone and estrogen |
| Column A (Disease) | Column B (Treatment) |
| (1) Pneumonia | ————– |
| (2) Malaria | ————– |
| (3) Ascariasis | ————– |
| (4) Typhoid | ————– |