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प्रश्न
At the time of birth, there are _______________ oocytes in the ovary of a female foetus.
पर्याय
1 to 2 million
2 to 3 million
2 to 4 million
none of these
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उत्तर
At the time of birth, there are 2 to 4 million oocytes in the ovary of a female foetus.
APPEARS IN
संबंधित प्रश्न
The process of release of the ovum from a mature follicle is called ______.
Describe the process of budding in hydra.
Give scientific reason.
There is a menopause when women are 45-50 years old.
Explain two main process in sexual reproduction.
At what stage of development are the gametes formed in newborn male and female?
Identify the labels (i-iv) in the given diagram of the ovum.
Identify the longest period of menstrual cycle.
Draw a labelled diagram of a Graafian Follicle.
In human beings, the largest cell formed during Oogenesis is ______
Which among the following has 23 chromosomes?
During embryonic development, the establishment of polarity along anterior/posterior, dorsal/ventral or medial/lateral axis is called ______.
Read the following and answer from given below:
Oogenesis is the process of the formation of an ovum in the ovaries. It consists of three phases: multiplication, growth, and maturation. Oogenesis is controlled by hormones GnRH, LH, FSH. GnRH secreted by the hypothalamus stimulates the anterior lobe of the pituitary gland to secrete LH and FSH.
Which cell division is involved in the formation of secondary oocytes?
Fetal sex can be determined by examining cells from amniotic fluid looking for:
Germ cells present in the seminiferous tubules undergo ______
How many primary oocytes produce one oogonia?
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?
In spermatogenesis, at the end of the first meiotic division ______ are formed.
Answer the following:
How many primary spermatocytes and oocytes are required for the formation of 100 spermatozoa and ova?
Distinguish between human sperm and ovum.
