Description : (i) Mention the event that induces the completion of the meiotic division of the secondary oocyte. (ii) Trace the journey of the ovum from the ovary, its fertilisation and further development until the implantation of the embryo. -Biology
Last Answer : (i)Secondary oocyte completes meiosis-ll only when a sperm enters its cytoplasm. It forms a larger cell, the ootid and a small cell, the second polar body. (ii)The secondary oocyte is ... and inner cell mass.The trophoblast attacheds to endometrium (implantation) and blastocyst gets embedded in it.
Description : In humans the oocyte is maintained in a state of meiotic arrest by the secretion of
Last Answer : In humans the oocyte is maintained in a state of meiotic arrest by the secretion of A. Granulosa cells B. Zona pellucida C. Cumulus oophorus D. Theca.
Description : In spermatogenesis, a primary spermatocyta produce four similar sperms while in oognesis a primary oocyte forms
Last Answer : In spermatogenesis, a primary spermatocyta produce four similar sperms while in oognesis a primary oocyte ... One large ovum and 2-3 polar bodies.
Description : Assertion : When sperm enters in egg , one polar body is released in human . Reason : At the time of ovulation eggs found in secondary Oocyte phase .
Last Answer : Assertion : When sperm enters in egg , one polar body is released in human . Reason : At the time ... False . D. If both Assertion & Reason are False.
Description : Assertion : Menarche starts around the age of puberty . Reason : After birth oocyte is matured and developed to form Graafian follicle .
Last Answer : Assertion : Menarche starts around the age of puberty . Reason : After birth oocyte is matured and ... D. If both Assertion & Reason are False.
Description : Assertion : In post natal life , oocyte development occurs in mature follicle Reason : After ovulation , Graafian follicle transforms in corpus luteum
Last Answer : Assertion : In post natal life , oocyte development occurs in mature follicle Reason : After ovulation , ... D. If both Assertion & Reason are False.
Description : Oocyte is liberated from ovary under the influence of LH, after completing
Last Answer : Oocyte is liberated from ovary under the influence of LH, after completing A. Meiosis and before ... . Meiosis II after release of first polar body
Description : A matured mammalian cell without nucleus is – (1) Lymphocyte (2) Erythrocyte (3) Spermatozoan (4) Oocyte
Last Answer : (2) Erythrocyte Explanation: Mammalian erythrocytes are unique among the vertebrates as they are nonnucleated cells in their mature form. These cells have nuclei during early phases of ... lose all other cellular organelles such as their mitochondria, Golgi apparatus and endoplasmic reticulum.
Description : Which of the following events is not associated with ovulation in human female? (a) Release of secondary oocyte (b) LH surge (c) Decrease in estradiol (d) Full development of Graafian follicle
Last Answer : (c) Decrease in estradiol
Description : Egg is liberated from ovary in (a) secondary oocyte stage (b) primary oocyte stage (c) oogonial stage (d) mature ovum stage.
Last Answer : (a) secondary oocyte stage
Description : The figure shows a section of human ovary. Select the option which gives the correct identification of either A or B with function/characteristic (a) B- Corpus luteum - Secretes progesterone (b) A- ... Secretes estrogen (d) A- Primary oocyte - It is in the prophase I of the meiotic division
Last Answer : (a) B- Corpus luteum - Secretes progesterone
Description : Meiotic division of the secondary oocyte is completed (a) prior to ovulation (b) at the time of copulation (c) after zygote formation (d) at the time of fusion of a sperm with an ovum.
Last Answer : (d) at the time of fusion of a sperm with an ovum.
Description : Nondisjunction of a chromosome results in which of the following diagnoses? a) Down Syndrome When a pair of chromosomes fails to separate completely and creates a sperm or oocyte that contains two ... genetic condition that may occur in a single family member as a result of spontaneous mutation.
Last Answer : a) Down Syndrome When a pair of chromosomes fails to separate completely and creates a sperm or oocyte that contains two copies of a particular chromosome (nondisjunction) Down syndrome results from three number 21 chromosomes.
Description : A matured mammalian cell without nucleus is (1) Lymphocyte (2) Erythrocyte (3) Spermatozoan (4) Oocyte
Last Answer : Erythrocyte