An abnormal human baby with ‘XXX’ sex chromosomes was born due to (a) fusion of two ova and one sperm (b) fusion of two sperms and one ovum (c) formation of abnormal sperms in the father (d) formation of abnormal ova in the mother.

An abnormal human baby with ‘XXX’ sex
chromosomes was born due to
(a) fusion of two ova and one sperm
(b) fusion of two sperms and one ovum
(c) formation of abnormal sperms in the father
(d) formation of abnormal ova in the mother.
by

1 Answer

Answer :

(d) formation of abnormal ova in the mother.
by

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Last Answer : (d) at the time of fusion of a sperm with an ovum.

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How many sperm and ova will be formed from 50 secondary oocytes and 50 secondary spermatocytes in human :-

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Last Answer : (a) being a diploid tissue

2. Perisperm and endosperm differ in a. Being a diploid tissue b. Being a haploid tissue c. Having no reserve food d. Formation of perisperm by fusion of the secondary nucleus with many sperms

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Last Answer : d. Formation of perisperm by fusion of the secondary nucleus with many sperms

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Last Answer : 3Being a diploid tissue

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Last Answer : Fertilization of sperm and ova takes place in: A. Cervix B. Ampulla C. Isthmus D. Vagina

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Description : What happens during fertilization when many sperms reach close to ovum

Last Answer : What happens during fertilization when many sperms reach close to ovum A. Cells of corona radiata trap ... the one nearest to ovum lose their tails.

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Last Answer : (a) who cannot produce an ovum

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Last Answer : (d) the ovum and sperms are transported simultaneously to ampullary-isthmic junction of the fallopian tube.

In human beings, normally in which part, does the sperm fertilize the ovum? -Do You Know?

Description : In human beings, normally in which part, does the sperm fertilize the ovum? -Do You Know?

Last Answer : answer:

Which one of the following statements about human sperm is correct? (a) Acrosome has a conical pointed structure used for piercing and penetrating the egg, resulting in fertilisation. (b) The sperm lysins in the acrosome dissolve the egg envelope facilitating fertilisation. (c) Acrosome serves as a sensory structure leading the sperm towards the ovum. (d) Acrosome serves no particular function

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human beings, normally in which part, does the sperm fertilize the ovum?

Description : human beings, normally in which part, does the sperm fertilize the ovum?

Last Answer : Fallopian tube

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Last Answer : (c) the ovum is fertilised externally and thereafter implanted in the uterus

Sex is determined in human beings (a) by ovum (b) at time of fertilisation (c) 40 days after fertilisation (d) seventh to eight week when genitals differentiate in fetus.

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Last Answer : (b) at time of fertilisation

Which one of the following is the most likely root cause why menstruation is not taking place in regularly cycling human female? (a) Maintenance of the hypertrophical endometrial lining (b) Maintenance of high concentration of sex- hormones in the blood stream (c) Retention of well-developed corpus luteum (d) Fertilisation of the ovum

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Last Answer : (b) Maintenance of high concentration of sex- hormones in the blood stream

Explain the mechanism of sex determination in humans. Or With the help of a flow chart explain in brief how the sex of a newborn is genetically determined in human beings. Which of the two parents, the mother or the father, is responsible for determination of sex of a child? -Biology

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Last Answer : Mechanism of Sex Determination in Human Beings: In human beings, the sex of the individual is genetically determined.Sex determination is the process by which sex of a new born individual can be ... happens at fertilisation. Thus, father is responsible for the determination of the sex of a child.

The process of formation of ova is called

Description : The process of formation of ova is called

Last Answer : The process of formation of ova is called A. Ovulation B. Oogenesis C. Oviparity D. Oviposition.

Male gametophyte in angiosperms produces (a) single sperm and two vegetative cells (b) three sperms (c) two sperms and a vegetative cell (d) single sperm and a vegetative cell.

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Last Answer : (c) two sperms and a vegetative cell

$ Sperm in Bryophytes are flagellated. ! Sperms in bryophytes move to the mature and dehisced archegonia, under the effect of chemicals.

Description : $ Sperm in Bryophytes are flagellated. ! Sperms in bryophytes move to the mature and dehisced archegonia, under the effect of chemicals.

Last Answer : $ Sperm in Bryophytes are flagellated. ! Sperms in bryophytes move to the mature and dehisced archegonia, under ... D. If both As and R are wrong.

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Description : Cu ions released from copper-releasing intra uterine devices (IUDs) (a) make uterus unsuitable for implantation (b) increase phagocytosis of sperms (c) suppress sperm motility (d) prevent ovulation.

Last Answer : suppress sperm motility

Which of the following approaches does not give the defined action of contraceptive? (a) Hormonal contraceptives Prevent/retard entry of sperms, prevent ovulation and fertilisation (b) Vasectomy Prevents spermatogenesis (c) Barrier methods Prevent fertilisation (d) Intra uterine devices Increase phagocytosis of sperms, suppress sperm motility and fertilising capacity of sperms

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Last Answer : (b) Vasectomy Prevents spermatogenesis

The function of copper ions in copper releasing IUDs is (a) they inhibit gametogenesis (b) they make uterus unsuitable for implantation (c) they inhibit ovulation (d) they suppress sperm motility and fertilising capacity of sperms.

Description : The function of copper ions in copper releasing IUDs is (a) they inhibit gametogenesis (b) they make uterus unsuitable for implantation (c) they inhibit ovulation (d) they suppress sperm motility and fertilising capacity of sperms.

Last Answer : (d) they suppress sperm motility and fertilising capacity of sperms.

Which one of the following statements is false in respect of viability of mammalian sperm? (a) Sperm is viable for only up to 24 hours. (b) Survival of sperm depends on the pH of the medium and is more active in alkaline medium. (c) Viability of sperm is determined by its motility. (d) Sperms must be concentrated in a thick suspension.

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Last Answer : (a) Sperm is viable for only up to 24 hours.

Set of reproductive terms are given below . Choose the set that has incorrect combination a ) sperms ,testis, sperm duct ,penis b)menstruation, egg, oviduct ,uterus c) sperm, oviduct, egg, uterus d)ovulation, egg, oviduct , uterus

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Last Answer : c) sperm, oviduct, egg, uterus

The function of copper ions in copper releasing IUD's is : (1) They inhibit gametogenesis (2) They make uterus unsuitable for implantation (3) They inhibt ovulation (4) The suppress sperm motility and fertilising capacity of sperms

Description : The function of copper ions in copper releasing IUD's is : (1) They inhibit gametogenesis (2) They make uterus unsuitable for implantation (3) They inhibt ovulation (4) The suppress sperm motility and fertilising capacity of sperms

Last Answer : (4) The suppress sperm motility and fertilising capacity of sperms

70. Which one of the following statements is false in respect of viability of mammalian sperm ? (1) Sperms must be concentrated in a thick suspension (2) Sperm is viable for only up to 24 hours (3) Survival of sperm depends on the pH of the medium and is more active in alkaline medium (4) Viability of sperm is determined by its motility

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Last Answer : Sperm is viable for only up to 24 hours

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Description : Explain the events that occur during fertilisation of an ovum in humans. How is it that only one sperm enters the OVUm? -Biology

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How is the entry of only one sperm ensured into an ovum during fertilisation in humans? -Biology

Description : How is the entry of only one sperm ensured into an ovum during fertilisation in humans? -Biology

Last Answer : During fertilisation, a sperm comes in contact with the zona pellucida layer of the ovum and induces changes (depolarisation) in the membrane that blocks the entry of additional sperms. This ensures that only one sperm can fertilise an ovum

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Description : What are both ovum and sperm ?

Last Answer : : Both ovum and sperm are haploid

Assertion : The acrosomal secretions of sperm , help it in entering in the cytoplasm of the ovum . Reason : It contains sperm lysin .

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Last Answer : Assertion : The acrosomal secretions of sperm , help it in entering in the cytoplasm of the ovum . ... . D. If both Assertion & Reason are False.

Various changes in mammalian sperm which prepare it to fertilise the ovum are called :

Description : Various changes in mammalian sperm which prepare it to fertilise the ovum are called :

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Last Answer : (b) just opposite to the site of entry of sperm into ovum

The second maturation division of the mammalian ovum occurs (a) shortly after ovulation before the ovum makes entry into the fallopian tube (b) until after the ovum has been penetrated by a sperm (c) until the nucleus of the sperm has fused with that of the ovum (d) in the Graafian follicle following the first maturation division.

Description : The second maturation division of the mammalian ovum occurs (a) shortly after ovulation before the ovum makes entry into the fallopian tube (b) until after the ovum has been penetrated by a sperm ... with that of the ovum (d) in the Graafian follicle following the first maturation division.

Last Answer : (b) until after the ovum has been penetrated by a sperm

Capacitation refers to changes in the (a) ovum after fertilisation (b) sperm after fertilisation (c) sperm before fertilisation (d) ovum before fertilisation.

Description : Capacitation refers to changes in the (a) ovum after fertilisation (b) sperm after fertilisation (c) sperm before fertilisation (d) ovum before fertilisation.

Last Answer : (c) sperm before fertilisation

Extrusion of second polar body from egg occurs (a) simultaneously with first cleavage (b) after entry of sperm but before fertilisation (c) after fertilisation (d) before entry of sperm into ovum.

Description : Extrusion of second polar body from egg occurs (a) simultaneously with first cleavage (b) after entry of sperm but before fertilisation (c) after fertilisation (d) before entry of sperm into ovum.

Last Answer : (b) after entry of sperm but before fertilisation