Advertisements
Advertisements
प्रश्न
Give scientific reason.
Older women are more likely to give birth to children with some abnormalities.
Advertisements
उत्तर
- A female has millions of oocytes at the time of birth and new ova are not formed thereafter.
- Menopause occurs at approximately 40-50 years of age and hence fewer numbers of eggs are present with reduced fertility since the oocytes have aged.
- Their ability to divide diminishes and they may not be able to complete meiotic division properly.
- Fertilization of such oocytes may result in the production of genetic abnormalities (like Down syndrome) in offspring.
Hence, older women are more likely to give birth to children with some abnormalities.
APPEARS IN
संबंधित प्रश्न
Give the name and function for ‘A’ and ‘B’ from the diagram given below
The following is the illustration of the sequence of ovarian events (a − i) in a human female
(i) Identify the figure that illustrates ovulation and mention the stage of oogenesis it represents.
(ii) Name the ovarian hormone and the pituitary hormone that have caused the above mentioned event.
(iii) Explain the changes that occur in the uterus simultaneously in anticipation.
(iv) Write the difference between ‘c’ and ‘h’.
(v) Draw a labeled sketch of the structure of a human ovum prior to fertilization.
Briefly describe the process of spermatogenesis.
Implantation of embryo occurs in ______.
Body breaks up into several fragments and each fragment starts to live as a new individual. This is ______ type of reproduction.
Which precautions will you follow to maintain the reproductive health?
Mammalian egg is ____________.
The Androgen Binding Protein (ABP) is produced by ____________.
The following is the illustration of the sequence of ovarian events (a-i) in a human female.
Identify the figure that illustrates ovulation and mention the stage of oogenesis it represents.
Identify the proper order of spermatogenesis and choose the correct option.
Conversion of spermatid into sperm is called as _______.
After ovulation, Graafian follicle regresses into ______.
Which among the following has 23 chromosomes?
Which of the following are called dual gland?
What does the figure represent?
The mother germ cells are transformed into a mature follicle through series of steps. Provide the missing steps in the blank boxes.
During reproduction, the chromosome number (2n) reduces to half (n) in the gametes and again the original number (2n) is restored in the offspring. What are the processes through which these events take place?
What is the difference between a primary oocyte and a secondary oocyte?
How many spermatozoa are formed from one secondary spermatocyte?
In which structures does spermatogenesis occur?
