A couple undergoes a workup for infertility, which shows that the man has a low sperm count. The couple asks why this is a problem because "it only takes one sperm to fertilize an egg." How could you explain their problem? O The flagella of many sperm must beat against the zona pellucida of the oocyte to destroy it before a single sperm can penetrate. O Many sperm must enter the egg before one is chosen to complete fertilization. O The corona radiata that surrounds the oocyte contains many macrophages that kill most of the sperm that reach the egg. O Although a single sperm fertijizes the egg, many others prepare the egg for its entry.

Q: Integration of the nuclear envelope, reappearance of the nucleus, uncoiling of the chromosomes, and…

A: Introduction :- The process of mitosis, which splits the duplicated genetic material carried in the…

Q: During Sexual Reproduction what occurs when a sperm cell enters an egg cell

A: Reproduction is the biological phenomenon by which offspring are produced by individual organisms.…

Q: Howw many different cell types would you find at the embryonic stages (cleavage, blastocyst, the…

A: After fertilization, the zygote and its associated membranes referred as the conceptus. During the…

Q: Which of the following does not occur during cleavage?A. Rapid DNA synthesisB. Cell growthC.…

A: Step 1 Early development or embryogenesis is the development of an embryo from the fertilized ovum.…

Q: Mitosis results in two identical diploidcells. What structures form during prophase?

A: Mitosis is a cell division that occurs in all somatic cells. It is an equational division that…

Q: Each egg cell develops in its own fluidfilled space called a/an _____.

A: Each egg cell develops in its own fluid-filled space called a/an Follicle. The follicle assumes a…

Q: In the fallopian tube, an egg cell is moved toward the uterus by: simple columnar epithelium…

A: The uterus is connected to the ovaries through two long, narrow tubes. The ovaries send eggs to the…

Q: How are mammalian sperm cells produced and incubated at a lower temperature than body temperature?

A: Mammalian sperm is the male gamete that is produced by the process of spermatogenesis in males. Once…

Q: Based on your understanding of cellular organelles and their roles, what happens to a sperm cell…

A: The process of reproduction in humans occurs sexually. In this process, the fusion of male and…

Q: . Which stage of the cell cycle occurs immediately after the stage inwhich the chromosomes become…

A: Cell division is the cycle by which a parent cell separates into at least two little girl cells.…

Q: A friend tells you that she doesn’t want tofeed her baby high-production milk because she is afraid…

A: The development of the body includes physical growth which refers to an increase in size. The growth…

Q: Differentiated Differentiated cells in a developing embryo derive from

A: The development of an embryo occurs in different layers. Every cell in the body have different…

Q: Fill in the blank:  The umbilical cord contains three blood vessels, two of which are…

A: Umbilical cord connects the developing embryo to the placenta of the mother. It is responsible for…

Q: Human Reproductive System has a lot of surprising facts that maybe you haven't heard about; one of…

A: The human reproductive system is the vital system that is responsible for the formation of new…

Q: removing a sperm nucleus and injecting it into the egg, could this procedure ever produce viable…

A: Yes, it may fuse with the egg because due to non motility sperm can not able to reach to the…

Q: Sponge archeocytes can differentiate into A. eggs (oocytes) B. sperm C. choanocytes…

A: Sponges are organised at a cellular level. They don't have any features that may be classified as…

Q: A female egg cell has two outer membranes how does the egg cell prevent polyspermy? if polyspermy…

A: Sexual reproduction refers to the form of reproduction that occurs through the union of male and…

Q: The zona fasciculata thickens significantly in pregnant women. What do you think would be the…

A: Adrenal glands are the type of endocrine glands which are located above the kidneys. They are…

Q: How do you expect Kartagener syndrome leads to infertility?   A. The lack of a plasma membrane means…

A: Primary ciliary dyskinesia(PCD) is a rare autosomal Recessive genetic disorder. PCD is a genetically…

Q: What special features are evident in sperm cells butnot in somatic cells, and how do these…

A: Somatic cells are globular in shape under the microscope. Sperm cells are elongated and consists of…

Q: Draw the diagram of male thallus and female thallus and differntiate them?

A: The thallus is the vegetative a part of the body which will not differentiate into roots, stem, and…

Q: In a 24-year-old man, which of the following cell types are most likely to be in the process of…

A: Testis is the part of male reproductive system. It is found in the scrotum 2gich provides the 2°C…

Q: Estrogen is a female hormone that helps develop and maintain the reproductive system. Estrogel…

A: Estrogen and Its Effects Estrogens are steroids that are important in the reproductive cycles of…

Q: Cleavage is a unique type of cell division that occurs ____

A: Cleavage is a cell division and by this process a number of cells produced, known as blastomeres.

Q: Rarely, two sperm may penetrate a secondary oocyte. Do youthink this fertilized cell will survive…

A: Fusion of only one sperm takes place with the egg.

Q: Most mammals, including humans have alecithal type of egg, which means that there is negligible or…

A: In lower organisms the yolk provides the nourishment to the growing embryo. But in mammals the…

Q: Embryonic stem cells come from

A: Answer: EMBRYONIC STEM CELLS are the pluripotent cell lines , these cells are characterized by their…

Q: Describe the three stages of cellula stage takes place.

A: The breakdown of glucose for the generation of energy is referred to as cellular respiration. It…

Q: Pathway (in order) of the following in the frog: a. urine b. egg cells c. sperm cells

A: Introduction :- In sexual reproduction, sperm is the male reproductive cell, or gamete (forms in…

Q: The procedure for determining vitality is to place sperm in a hypotonic solution and observe the…

A: Since you have asked multiple questions, we will solve the first question for you. If you want any…

Q: At puberty, the testes contain a finite number of cells and producean enormous number of sperm cells…

A: Spermatogenesis could be a joint sequence of events throughout maturation of spermatogonia into…

Q: Differentiate between human skin cell and human ovum.

A: Cell is a basic membrane-bound unit and it is often called as the basic building blocks of all…

Q: Which mechanism prevents an ovum from being fertilized by multiple sperm cells? A. Once a sperm…

A: An egg should be prepared by only one sperm in particular. To forestall polyspermy, the zona…

Q: Fill in the blank: The umbilical cord contains three blood vessels, two of which are

A: The umbilical cord joins the developing embryo to the mother's placenta. It is in charge of…

Q: As a sperm cell finally approaches its final target, its acrosome becomes activated.  The acrosome…

A: the interaction between the ovum and the acrosome hydrolytic enzymes leads to series of changes in…

Q: what would likely occur if cilia were paralyzed at the time of ovulation?

A: Ovulation is the process of release of ovum from the ovary. It occurs when the FSH and LH both…

Q: Which of the folowing cels have cell wal? O B and C A and B

A: Only have cell walls if the cells are plants.They do have a nucleus. The cell wall is a rigid…

Q: After the sperm cells enter a synergid, one fertilizes the egg in a two-step process. First there is…

A: Fertilization is a process which includes fusion of haploid male and female gametes (egg and sperm)…

Q: Which of the following occurs during cytokinesis? O continuous kinetochore microtubule shortening O…

A: The cell division causes the formation of identical daughter cells from the parent cell. The types…

Q: (a) Starting with a fertilized egg (zygote), a series of five cell divisions would produce an early…

A: We are answering the first question only. For the rest of the questions please repost. A zygote can…

Q: Which statement does not describe cell cycle checkpoints? Normal checkpoints assess damage to DNA. B…

A: Checkpoints are involved in detecting any kind of cellular defect, arresting the progression of the…

Q: T.S. of mammalian testis revealing seminiferous tubules show different types of cell.(i) Name the…

A: The male reproductive system is located in the pelvis region. It includes a pair of testes along…

Q: Mitosis and Meiosis In which stage do cells spend the majority of their time? How do you know?

A: Mitosis forms that part of the cell cycle in which the cell division is equational that is the…

Q: Some sperm mitochondria enter an egg during fertiliza- tion, but as sperm mature these mitochondria…

A: Fertilization in humans refers to the fusion of male and female gametes that facilitates the…

Q: Which of the following best describes the anaphase checkpoint? O Verifies that cells are large…

A: Interphase: During the cell division DNA duplicates and grow cell in interphase. It is the main…

Q: How many pairs of chromosomes does this HeLa cell have?

A: This HeLa cell has 82 chromosomes.

Q: Fill in the blank:  The anterior end of a sperm head, called the _______________________, contains…

A: There are two types of sex cells, namely sperm (male gamete) and egg (female gamete). The male…

Q: This cell is in the stage of mitosis known as O interphase. O metaphase. O telophase. O prophase. O…

A: Mitosis is a procedure where an unmarried cell divides into two same daughter cells During mitosis…

Q: Order the events leading to the sperm's nucleus fusing with the egg's nucleus.   Question 1…

A: Fertilization is defined as the union of sperm and ova. Fertilization leads to formation of zygote.