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प्रश्न
Give scientific reason.
The new individual produced by sexual reproduction always has the recombined genes of both the parents.
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उत्तर
- Sexual reproduction involves two parents i.e. male parent and female parent.
- The male gamete coming from a male parent fuses with a female gamete of a female parent to form a zygote which develops into an embryo and then into a new individual.
Thus, the new individual always has the recombined genes of both the parents.
संबंधित प्रश्न
When pregnancy does not occur, the life of corpus luteum is about ______.
Name the following:
The accessory gland in human males whose secretion activates the sperms
Suppose a normal woman has never borne a child; How many mature eggs would she have produced in her lifetime? Your calculation should be based on two clues-
(a) Eggs are produced at the rate of 1 egg every 28 days (one menstrual cycle)
(b) A woman’s total reproductive period is 13 – 45 years.
Give appropriate term of the following:
The attachment of developing zygote (blastocyst) on the uterine wall.
Define the following:
Ovulation
Define the following:
Spermatogenesis
The following diagram represents the vertical sectional view of the human female reproductive system.
How does the uterus prepare for the reception of zygote?
The diagram given below is that of a developing human foetus in the womb. Study the same and answer the question that follow:
What term is given to the period of development of the foetus in the womb?
Where does fertilization occur?
How is the fetus protected?
Give Reasons
The oviduct funnel is lined with cilia.
Study the diagram given below and then answer the questions that follow:
(i) Name the part labeled A. Name any two hormones produced by the part labeled A.
(ii) What happens to the part labeled B.
(1) if fertilization takes place?
(2) If fertilization does not take place?
(iii) Where does fertilization occur?
(iv) Draw a neat diagram of the human sperm as seen under high magnification and label the following parts.
(1) Acrosome
(2) Mitochondria
Complete the following sentences with appropriate word:
The sperms in a human male are produced in _____.
Complete the following sentences with appropriate word:
The process of releasing an egg from the ovary is called _________.
What would be the effect if meiosis did not occur in nature?
What is fertilization?
The eggs of frogs do not have shells for protection, yet they are safe in water, how?
State whether True or False:
The chromosome number in germ cells producing the gametes are diploid.
Write the specific location of the following:
Acrosome
