High School Biology Help » Cell Biology » Cell Division » Meiosis » Understanding Oogenesis
Explanation:

Throughout the menstrual cycle, commonly only one follicle matures and also is fertilized. The follicles that perform not mature are referred to as polar bodies and degenerate. However, periodically multiple follicles remajor and also are accessible to be fertilized, resulting in genetically unique embryos, known as fraternal twins.


After a main oocyte divides meiotically, three haploid cells are created. What is the term for the two smaller sized cells that typically discombine and also are not fertilized?


Explanation:

Normally, each menstrual cycle produces three major oocytes. Two of these major oocytes are inevitably smaller sized than the third and also generally disincorporate before maturation and also fertilization. These two cells are known as polar bodies. Generally, meiosis results in four daughter cells that are all haploid. However, after meiosis I of oogenesis, there are 2 daughter cells, one main oocyte, and a polar body. After meiosis II, the major oocyte divides right into an additional oocyte and also an additional polar body. However, the polar body that was a result of the first meiotic department typically does not finish meiosis, and therefore does not divide again.

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Example Inquiry #12 : Understanding Oogenesis


What have to happen for a second oocyte to finish meiosis II?


Possible Answers:

Implantation


Menstruation


Fertilization


Uterine contractions


Degeneration


Correct answer:

Fertilization


Explanation:

The additional oocyte completes meiosis II only once fertilized by a spermatozoan. After fertilization is initiated, the second oocyte starts its second meiotic department, resulting in the development of a mature ovum and also an additional polar body. At this point, the ovum is ready to fuse with the spermatozoan.


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Example Concern #11 : Understanding Oogenesis


Wright here does fertilization of the ovum commonly occur?


Possible Answers:

Ovary


Uterus


Cervix


Follicle


Fallopian tube


Correct answer:

Fallopian tube


Explanation:

Fertilization commonly occurs in the fallopian tube. After fertilization, the diploid zygote will certainly begin the process of implantation into the uterus, wright here it undergoes mitotic departments. The resulting multicellular organism is called the embryo, which further creates in the uterus into a fetus.


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Example Question #15 : Understanding Oogenesis


In humale females, an ovum is released right into the fallopian tube roughly just how often?


Possible Answers:

Only after fertilization


Once a day


All the eggs are released at birth


Eextremely 28 days


Once a year


Correct answer:

Eexceptionally 28 days


Explanation:

Typically, one ovum is released eexceptionally 28 days in human females. These 28 days constitute the menstrual cycle, which may differ in size, but on average, the cycle takes 28 days. A female is born via all the eggs she will certainly ever have, and after the initiation of menstruation, one egg is released every 28 days till menopausage.


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Example Question #11 : Understanding Oogenesis


What hormone stimulates main oocytes to resume meiosis?


Possible Answers:

Estrogen


Luteinizing hormone


Thyroid-stimulating hormone


Person chorionic gonadotropin


Follicle-stimulating hormone


Correct answer:

Follicle-stimulating hormone


Explanation:

At the start of the menstrual cycle, elevated follicle-stimulating hormone (FSH) stimulates main oocytes to resume meiosis. A spike in luteinizing hormone (LH) triggers ovulation. Thyroid-stimulating hormone (TSH) and also human chorionic gonadotropin (hCG) are involved in thyroid hormone secretion, and in maintenance of the corpus luteum throughout pregnancy, respectively. Estrogen is a female sex hormone, and has an instraight regulatory role in meiotic divisions of ova.


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Example Question #11 : Understanding Oogenesis


Where does oocyte development take place in humans?


Possible Answers:

Placenta


Fallopian tubes


Uterus


Cervix


Ovaries


Correct answer:

Ovaries


Explanation:

An oocyte develops in the ovaries in the time of female gametogenesis. If the oocyte inevitably becomes an ovum and is fertilized in the fallopian tubes, the resulting gamete will certainly be implanted in the uterus. The placenta is an body organ that connects the occurring fetus to the uterine wall, and also the cervix is the reduced portion of the uterus that sepaprices the vagina from the uterus.

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Example Concern #11 : Understanding Oogenesis


How many chromosomes does a normal human gamete have?


Possible Answers:

*


*


*


*



Correct answer:


Explanation:

When gametes join they develop a cell called a zygote. Human being sperm and also eggs contain 23 chromosomes. Person zygotes contain 46 chromosomes. The kind of cell division that produces gametes with half the normal chromosomes is referred to as meiosis.


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Example Inquiry #11 : Understanding Oogenesis


Spermatogenesis produces 4 viable spermatozoa. What is produced during oogenesis?


Possible Answers:

Four mature ova


One mature ovum and also three polar bodies


Four mature polar bodies


Three mature ova and one polar body


Correct answer:

One mature ovum and 3 polar bodies


Explanation:

Throughout oogenesis—at the end of meiosis and also cytokinesis—an oogonium divides right into one mature ovum capable of being fertilized and also three polar bodies that are reabsorbed, while a spermatogonium divides right into four viable spermatozoa capable of fertilization.


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