Advertisements
Advertisements
Question
What would be the ratio of chromosome number between an egg and its zygote? How is the sperm genetically different from the egg?
Advertisements
Solution
The egg is produced through meiosis so it contains half the number of chromosomes than a zygote. So, the ratio of chromosome number between an egg and zygote is 1:2. Human males have two types of sex chromosomes - X and Y whereas human females have two X chromosomes. So, the sperms contain either X or Y chromosome whereas eggs contain only X chromosome leading to genetic difference between them.
APPEARS IN
RELATED QUESTIONS
What are the measures one has to take to prevent from contracting STDs?
Our government has intentionally imposed strict conditions for M.T.P. in our country. Justify giving a reason.
What is the causative organism for the following disease?
Syphilis
Describe the surgical methods of birth control for women.
One of the following is a surgical method which prevents the sperms from reaching the ovum and pregnancy does not occur. This method is :
(a) IUCD
(b) vasectomy
(c) condom
(d) tubectomy
A woman uses a device X made of a common metal for preventing pregnancy. This device works by preventing the implantation of fertilised egg cell (or embryo) in the female organ Y.
(a) What are the two names of device X?
(b) Name the organ Y.
(c) Can this method of contraception protect a woman from acquiring a STD?
List four ways of preventing pregnancy. State two advantages of using such preventive methods.
What are Sexually Transitted Diseases (STD)? List two viral and two bacterial STDs.
Expand the following abbreviation:
IUCD
Give scientific reasons.
Indians should follow family planning for controlling the population.
Surgical methods of contraception prevent gamete formation.
RCH stands for ______.
The technique which makes use of amniotic fluid for the detection of prenatal disorder is called as ______.
First or free milk is called ______.
Which of the following method of contraception protects from acquiring sexually transmitted diseases?
Why does bread mould grow profusely on a moist slice of bread rather than on a dry slice of bread?
Observe the chart and graph given in the figure carefully and answer the following questions.
| Age in Years |
% of full height | |
| Boys | Girls | |
| 8 | 72% | 77% |
| 9 | 75% | 81% |
| 10 | 78% | 84% |
| 11 | 81% | 88% |
| 12 | 84% | 91% |
| 13 | 88% | 95% |
| 14 | 92% | 98% |
| 15 | 95% | 99% |
| 16 | 98% | 99.5% |
| 17 | 99% | 100% |
| 18 | 100% | 100% |
- Which of the line represents the height of boys?
- Which line represents the height of girls?
- What is the difference between the pattern of increase in the height of boys and girls?
- Is this pattern true for each individual?
Select the statement which is not correct about reproductive health?
Amniocentesis is a technique used to ______.
Which is the most commonly prescribed non-steroidal oral contraceptive pill in India?
