BGD Practical - Fertilization to Implantation Quiz

From Embryology

BGDsmall.jpg Here are a few simple questions that relate to your introduction to embryology lecture and practical, this page is not a part of today's Practical class.

You should try in your own time after completing the Practical today.

Take the Quiz

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{Which of the following statements is most correct about the human menstrual cycle. |type="()"} - The menstrual cycle in all women is a 28 day reproductive cycle - Ovulation always occurs at the midpoint of the menstrual cycle - The menstrual cycle's main function is to regularly replace the lining of the uterus - A high body temperature indicates ovulation is occurring + The menstrual cycle is an endocrine cycle regulating reproductive physiological changes ||The menstrual cycle is variable amongst women and also within an individual, the "28 days" is an average time course. Like the cycle itself, the time of ovulation can vary anywhere between day 10 - day 19. The uterine lining (functional layer) is replaced ever cycle, though this would not be considered the main function of the cycle. The body temperature does increase at ovulation, but it remains high even after this point, it is the time of change that indicates ovulation.

{Most pregnancies can be detected by pregnancy tests soon after fertilization. |type="()"} - true + false ||Following fertilization, at least 1 to 2 weeks of development must occur before implantation commences, it is only after implantation that a pregnancy tests work.

{Which of the following statements is correct about the zona pellucida: |type="()"} - surrounds the oocyte in the ovary - protects oocyte in the uterine tube - is a specialized extracellular matrix - is important for fertilization + all of the above ||Yes, the zona pellucida has many different functions at different times of oocyte development, fertilization and in the first week of development.

{Pregnancy tests generally are based upon the detection in maternal urine of: |type="()"} - Estrogen - Progesterone - human Chorionic Somatommotropin + human Chorionic Gonadotrophin - human Chorionic Corticotropin ||Chorionic Corticotropin (hCG) secreted initially by the trophoblast cells is detected in the maternal urine/blood. Estrogen and Progesterone are made in the ovary and support the endometrium. human Chorionic Somatommotropin (or placental lactogen, stimulate maternal mammary development) and human Chorionic Corticotropin (hCG) are both made by the placenta later in development.

{The most correct sequence of early development following fertilization is: |type="()"} + zygote, blastomeres, morula, blastocyst - oocyte, zygote, morula, blastocyst - zygote, conceptus, blastocyst - polar bodies, zygote, conceptus, blastocyst ||The oocyte is present before fertilization, the conceptus refers to all the products of fertilization and is not a developmental stage, polar bodies are small exclusion bodies enclosing the excess DNA from oocyte meiosis. I did not discuss in detail blastomeres a term often used to describe the first cells formed from zygote mitosis.

{Which process in the third week of development converts the embryonic disc into the trilaminar embryo. |type="()"} - placentation + gastrulation - neuralation - somitogenesis - embryonic disc folding ||Gastrulation, meaning gut formation, converts the early embryonic disc into the trilaminar or 3 germ layer embryo (ectoderm, mesoderm, endoderm).

{Which of the following statements about Figure 1 (shown below) is most correct: |type="()"}

- figure 1 shows a normal female karyotype - figure 1 shows all human chromosomes + figure 1 shows a metaphase spread of a human genome - figure 1 shows an abnormality of mitosis

||This is a metaphase spread of a female with trisomy 21 (Down syndrome), though abnormal it is still a human genome (just not the normal human genome). It is not the normal female karyotype (number and appearance of chromosomes) and does not show the Y chromosome (as this is female XX). This is the most common human genetic abnormality and the additional chromosome is thought to occur due to incorrect meiosis.


Figure 1
Figure 1

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Cite this page: Hill, M.A. (2019, January 17) Embryology BGD Practical - Fertilization to Implantation Quiz. Retrieved from

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© Dr Mark Hill 2019, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G