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提问人：网友sunnyboy508 发布时间：2022-01-07

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During ovulation,the secondary oocyte resides at what specific stage of meiosis？

A、Prophase of meiosis I

B、Prophase of meiosis II

C、Metaphase of meiosis I

D、Metaphase of meiosis II

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更多“During ovulation,the secondary oocyte resides at what specific stage of meiosis？”相关的问题

第1题

Basic to any understanding of Canada in the 20 years after the Second World War is the country's impressive population growth. For every three Canadians in 1945, there were over five in 1966. In September 1966 Canada's population passed the 20 million mark. Most of this surging growth came from natural increase. The depression of the 1930's and the war had held back marriages, and the catching-up process began after 1945. The baby boom continued through the decade of the 1950's, producing a population increase of nearly fifteen percent in the five years from 1951 to 1956. This rate of increase had been exceeded only once before in Canada's history, in the decade before 1911, when the prairies were being settled. Undoubtedly, the good economic conditions of the 1950's supported a growth in the population, but the expansion also derived from a trend toward earlier marriages and an increase in the average size of families. In 1957' the Canadian birth rate stood at 28 per thousand, one of the highest in the world.

After the peak year of 1957, the birth rate in Canada began to decline. It continued falling until in 1966 it stood at the lowest level in 25 years. Partly this decline reflected the low level of births during the depression and the war, but it was also caused by changes in Canadian society. Young people were staying at school longer; more women were working; young married couples were buying automobiles or houses before starting families; rising; living standards were cutting down the size of families. It appeared that Canada was once more falling in step with the trend toward smaller families that had occurred all through the Western world since the time of the Industrial Revolution.

Although the growth in Canada's population had slowed down by 1966 (the increase in the first half of the 1960's was only nine percent), another large population wave was coming over the horizon. It would be composed of the children who were born during the period of the high birth rate prior to 1957.

What is the main idea of the passage?

A．Educational changes in Canadian society.

B．Canada during the Second World War.

C．Standards of living in Canada.

D．Population trends in postwar Canada.

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第2题

Concerning maturation of the female gamete(oogenesis),when do the oogonia enter meiosis I and undergo DNA replication to form primary oocytes?

A、During fetal life

B、At birth

C、At pubery

D、With each ovarian cycle

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第3题

Where do primordial germ cells initially develop?

A、In the gonads at week 4 of embryonic development

B、In the yolk sac at week 4 of embryonic development

C、In the gonads at month 5 of embryonic development

D、In the gonads at puberty

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第4题

A 20-year-old woman presents at the emergency department with severe abdominal pain on the right side with signs of internal bleeding. She indicated that she has been sexually active without contraception and missed her last menstrual period. Based on this information, which of the following disorders must be included as an option in the diagnosis?

A、Ovarian cancer

B、Appendicitis

C、Normal pregnancy

D、Ectopic tubal pregnancy

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第5题

When does a secondary oocyte complete its second meiotic division to become a mature ovum?

A、At ovulation

B、Before ovulation

C、At fertilization

D、At puberty

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第6题

How soon after fertilization occurs within the uterine tube does the blastocyst begin implantation?

A、By 12 hours

B、By day 1

C、By day 2

D、By day 7

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第7题

Where does the blastocyst normally implant?

A、Functional layer of the endometrium

B、Basal layer of the endometrium

C、Myometrium

D、Perimetrium

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第8题

Which of the following events is involved in the cleavage of the zygote during week 1 of development?

A、Production of highly differentiated blastomeres

B、An increased cytoplasmic content of blastomeres

C、An increase in size of blastomeres

D、A decrease in size of blastomeres

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第9题

Which of the following structures must degenerate for blastocyst implantation to occur?

A、Endometrium in progestational phase

B、Zona pellucida

C、Syncytiotrophoblast

D、Cytotrophoblast

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第10题

Individual blastomeres were isolated from a blastula at the 4-cell stage. Each blastomere was cultured in vitro to the blastocyst stage and individually implanted into four pseudopregnant foster mothers. Which of the following would you expect to observe 9 months later?

A、Birth of one baby

B、Birth of four genetically different babies

C、Birth of four genetically identical babies

D、Birth of four grotesquely deformed babies

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