A chemical that can cause a birth defect is aa. toxin.b. trisomy.c. mutagen.d. teratogen.

Q: Explain the role of placenta for human life ?

A: Placenta act as channel to exchange matter from mother to foetus. Placenta bind to foetus with the…

Q: The timing of puberty can be influenced by which of the following? a. genes b. stress c. amount of…

A: BASIC INFORMATION  PUBERTY  It is basically the process in which there is changes in the body.  The…

Q: Placenta ... a) ... develops from trophoblast cells. b) ... develops from embryoblast cells. c)…

A: Pregnancy occurs when the male gamete sperm fuses and fertilizes with the female egg that is…

Q: Explain how the structure of the placenta prevents mixing of fetal and maternal blood while allowing…

A: -First to understand placenta .  Placenta -- It is composed of fetal part which includes the…

Q: Define a teratogen and provide several examples of teratogens.

A: BASIC INFORMATION  ENZYMES They are the catalyst. They help in accelerating the chemical reaction.…

Q: The umbilical cord connects the developing fetus to thea. mother’s belly button.b. placenta.c.…

A: Reproduction is the process by which an organism creates more of its own progeny. During…

Q: What are the MAJOR categories of teratogens?   a) Drugs and alcohol, radiation, poor nutrition b)…

A: KEY WORDS:- Teratogens - It is the agents such as  of biological or chemical that can induce effects…

Q: Early pregnancy tests used antibodies to detect the presence of human chorionic gonadotropin (hCG)…

A: The outermost membrane that surrounds the embryo is known as chorion. From the outer fold of the…

Q: Why does a mouse embryo develop faster than a human embryo, for example?

A: The similarities between humans and mice permit the study of the development of humans and their…

Q: Nutrient and waste requirements for the developing fetus are handled during the first few weeks by:…

A: Endometrium is the innermost lining of the uterus which undergoes cyclic changes during…

Q: Which of the following structure develops into only the fetus? A. Blastocyte B. Zygote C.…

A:

Q: Which syndrome can affect the gonad?  a. Turner Syndrome b. Klinefelter Syndrome c. Both d.…

A: INTRODUCTION Turner syndrome Turner syndrome is the syndrome that affect gonad. This syndrome is…

Q: The surface that enables active and passive exchange between the fetal and maternal bloodstreams is…

A: Answer is b.)  chorionic villi.

Q: Which of the following consists of both fetal and maternal tissues? (a)umbilical cord (b) placenta…

A: The unborn offspring that is known to develop from an embryo is called the fetus. The overall…

Q: a) How are oocytes released?  b) How are spermatozoa released?  c) What is the frequency of both?…

A: Meiosis is a cell division in which the diploid cell divides into a haploid cell, reducing the…

Q: What technology would enable a fetus born in the fourth month to survive in a laboratory setting?…

A: First of all, it is nearly impossible that four months (12 or 13 weeks) fetus can survive outside…

Q: In the sentence "The placenta performs an important function for the fetus," what does the word…

A: The placenta is a temporary fetal organ that begins developing from the blastocysts shortly after…

Q: Which of the following is false? a. The endoderm, mesoderm, ectoderm are germ layers. b. The…

A: The fusion and amalgamation of the male spermatozoa with the ovum of the female are the…

Q: Explain the process of fertilisation and implantation.

A: Fertilization is the process of the union of mobile sperm cell and immobile egg, generally taking…

Q: . The structure labeled C, within which development occurs, is known as the a. placenta. b. oviduct…

A: The picture is showing the foetus in the womb of mother.

Q: What is the differences between Mammals and Frogs in Spermatogenesis?

A: Gametogenesis is the process of manufacturing gametes or daughter cells in gamete-producing mother…

Q: During embryonic development, unique cell layers develop into specific groups of tissues or organs…

A: The development of a plant or animal embryo is called embryogenesis. This process starts with the…

Q: A previously infertile couple wishes to have a pregnancy but the man produces non-motile sperm. If…

A: The fusion of male and female gamete leads to fertilization.

Q: Describe the processes of fertilization and implantation

A: Fertilization: The process of fertilization involves the fusion of the nuclei of the male sperm with…

Q: Which of the following type of placenta is found in humans? a) Discoidal b) Zonary c) Diffuse d)…

A: Introduction - During the pregnancy phase, the placenta is an organ that grows inside the uterus. A…

Q: Which of the following statements is not true about the placenta?  A. It provides exchange of wastes…

A: During pregnancy, inside the uterus, the organ placenta develops. It is found attached to the wall…

Q: Chemicals that pass through the placenta’s screen and mayharm an embryo or fetus are called…

A: The common chromosomal abnormality that occurs due to a missing or extra chromosome number is called…

Q: Which of the following does NOT happen in the germinal period? a. dividing mass of cells travels to…

A: During the nine months of a female's pregnancy, an infant goes through a lot of changes. An infant's…

Q: Describe the structure and functions of the four extraembryonic membranes

A: The layers inside the egg around the embryo are called extraembryonic membranes, and they nourish…

Q: The process by which the structure labeled B is released from the structure labeled A is known as?…

A: The picture is showing the female reproductive system. It consists of ovary(A), Fallopian tube (C),…

Q: Compare and contrast the following terms: A young pregnant woman comes into the physician’s office…

A: Physicians play an important role in the health sector. They do not only help in prescribing…

Q: What part of an infant’s body is said to stay in an immature state until needed to produce more…

A: Human stem cells are one-of-a-kind cells that have the ability to differentiate into a wide range of…

Q: During the embryonic developmen, the trophoblast will developed into  Select one: A. The embryonic…

A: Developmental biology focuses on the study of developmental sequences of organisms. The embryonic…

Q: Describe the process of neuralation.  b) Identify the germ layer from which the nervous system…

A: The time amid conception and birth is known as gestation. The baby develops and grows within the…

Q: The Embryonic stem cells can be derived from _______ which is developed by  “invitro…

A: The egg cell fuses with the sperm cell to form the zygote. The zygote develops into an embryo where…

Q: After the eighth week of development an embryos is referred to as what?

A: After the 8th week of development, the embryo is referred to as "fetus"

Q: Describe the roles of the four extraembryonic membranes.

A: Introduction :- One of the membranes that aid in the development of the embryo is the extraembryonic…

Q: It appeared, then, that something in the region of the gray crescent was essential for proper…

A: The amphibian eggs, when divided into two blastomeres along the plane of first division, the cells…

Mitochondrial Mutations

A mitochondrion is a cellular organelle that serves as the site for cellular respiration and energy production (ATP or Adenosine Triphosphate). It is a double-membrane-bound organelle and is only present in eukaryotic cells.