In animals, a key difference between spermatogenesis andoogenesis is thata. only oogenesis involves meiosis.b. only spermatogenesis involves meiosis.c. spermatogenesis produces four sperm, whereas oogenesisproduces only one egg cell.d. None of the above describes a difference between the twoprocesses.

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

A: Answer is a.)  toxin.

Q: In humans, gametogenesis results in the formation ofa. diploid egg and sperm cells.b.…

A: As we know all living organisms are made of  basic unit of structure and function called as cell.…

Q: Regarding oogenesis, diplotene stage begins at a.birth b.Meiosis II c.7th month of fetal…

A: Diplotene is defined as the stage of meiosis II during which the homologous chromosomes remain…

Q: The number of chromosomes present in eurkaryotic cells a. is consistent during the life cycle b. is…

A: Eukaryotic cells consist of a nucleus and other organelles. Eukaryotic cells surrounded by the…

Q: Which of the following is not true about starfish eggs? Choose all possible answers a. eggs are…

A: Echinoderms with a star form that belong to the class Asteroidea are known as starfish or sea stars.…

Q: During oogenesis, oogenetic inhibitors must be deactivated after full growth to allow the

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

Q: Invagination of the sea urchin blastulaA. is preceded by changes in the shape of individual…

A: Invagination is a process occurring during gastrulation. It includes movement of cells at the…

Q: Along the notochord, segmented blocks of tissue that give rise to muscles, vertebrae, and connective…

A: Answer is d.) somites.

Q: The Life Cycle of the Horse Embryo Process 2 Zygote Process Gametes Process 3 Reproductive organs…

A: The life cycle of a horse, like many other sexually reproducing organisms, involves a series of…

Q: Which of the following cells canundergo meiosis?a. the diploid body cells of an animalb. haploid…

A: Meiosis is a type of cell division that is a reduction division. In this division, the chromosome…

Q: An abnormal fruit fly has two sets of autosomes and is XXY. Such a fly isa. a male.b. a female.c. a…

A: Sex determination is achieved by a balance of female determinants on the X chromosome and male…

Q: The inner cell mass of a human blastocysta. gives rise to the chorion.b. gives rise to the…

A: Cell is the basic unit of life. Based on the number of cells an organism may be prokaryotic or…

Q: For pattern formation to occur, the cells in the developing embryo must a. “know” their position…

A: The embryo formed after the fusion of the male and female gametes is the basis of the development of…

Q: At fertilization, a sperm contributes   a. a diploid nucleus.   b. mRNAs.   c. a centrosome.…

A: At the time of fertilization the mail contributes haploid sperm and the female contribute ova…

Q: Which of the following correctly identifies the stages in embryonic development between weeks 2 and…

A: Fertilization is a process in which haploid male gamete (sperm) fuses with the haploid female gamete…

Q: Internal and external fertilization differ in that species thata. produce an amniotic egg have…

A: The external fertilization process usually takes place in an aquatic environment where the male and…

Q: Compared with external fertilization, in internal fertilization,a. male gametes have a higher chance…

A: Fertilization  Fertilisation is a process in which the fusion of male and female gametes occurs.…

Q: Choose the best Polar bodies are produced duringa. DNA replication.            d. oogenesis.b.…

A: Polar bodies:                A small haploid cell which is formed at the same time as an egg cell…

Q: In a reptile egg, the extraembryonic membrane thatencloses the embryo in a watery environment is…

A: Answer is b.) amnion.

Q: Match the following with the term that best describes them ✓number of cells after meiosis ✓number of…

A: Reproduction is a biological process that is necessary for the survival of each species by the…

Q: Which of the following statements is FALSE? a. VegT and Veg1 induce both dorsal and ventral…

A: Here, we have to select the incorrect statement regarding development.

Q: One day while walking across campus, you see a female butterfly laying fertilized eggs, as shown in…

A: On a leaf, the female butterfly deposits fertilised eggs, initiating a number of developmental…

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: fertilization involving two different sized gametes

A: C. Fertilization involving two different sized gametes.

Q: Which of the following scenarios does NOT describe an event that leads to the conceptions of twins?…

A: While twin pregnancies can occur by some coincidence, there are a few factors that may expand your…

Q: Unchanging environments are advantageous to organismsa. that reproduce asexually.b. that undergo…

A: Asexual reproduction is the type of reproduction where there is no fusion of male and female gametes…

Q: 16. During chick and human development, cells that form the embryo come from the A. epiblast B.…

A: Embryo It is form after the formation of zygote which later turn into foetus.

Q: Label each tissue with the specific source germ cells: v Gastrointestinal tract A. Intermediate…

A: We are tripoblastic organisms that means we contains three types of germ layers that includes…

Q: Which of the following is generated by the totipotent fertilized egg, but not by the pluripotent…

A: Stem cells are specialized cells in humans which have the capacity to develop into different cell…

Q: Humans produce skin cells by mitosis and gametes by meiosis. Which of the following statements about…

A: Mitosis happens in skin: The resulting cells (daughter) have same number of chromosome as of…

Q: If cells from the presumptive neural ectoderm of a frog gastrula are transplanted onto the surface…

A: The gastrula formation occurs during the early stage of cell development. During gastrulation the…

Q: The zona pellucida is important in mammals because it...

A: The zona pellucida is a thick extracellular layer that covers all mammalian eggs and preimplantation…

Q: hich of the following statements is true?   a. No sperm cells have Y chromosomes.   b. All sperm…

A: Sperm is that the male germ cell, or gamete, in anisogamic varieties of reproduction (forms within…

Q: Cleavage... A. Is a developmental stage consisting of a cell layer surrounding a fluid-filled space…

A: Fertilization is the process by which the sperm and the egg combine to form a zygote, which is the…

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: If you add a chemical to an egg cell that prevents the fast and slow blocks from occurring but does…

A: The fast block to polyspermy can be accomplished by altering the electric potential of the egg…

Q: In humans, sexual reproduction that produces an embryo, which then develops into a fetus, requires:…

A: Both male and female members of the same species contribute genetic material during sexual…

Q: In organisms such as the chick, in which the egg has extensive yolk, the eggA. shows complete…

A: In organisms such as the chick, in which the egg has extensive yolk. Therefore the eggs of chick are…

Q: Which among these insects secrete seducin by the male which both attracts and pacifies the untamed…

A: All insects secrete pheromones to attract the opposite sex.  Bombus lapidaries, a bee, release…

Q: 1. Which of the following layers protect the mammalian oocyte during ovulation? * a. cortical and…

A: Structure of mammalian Oocyte:  mature mammalian Oocytes have many layers before ovulation- Follicle…

Q: What are some benefits that come with sexual reproduction? Please select all correct answers. a.…

A: Reproduction is a biological process possessed by living organisms to promote their number in nature…

Q: omental genetics terms with their correct definition.

A: Developmental Biology : It is the study of the process by which animals and plants grow and develop.…

Q: The process of meiosis ensures that organisms will have a. The same diploid number its parents have.…

A: For cell growth and development of the body, the cell increases its number by the process of cell…

Q: Flagellum is a name for Answers A. the fringe-like folds move the egg down the fallopian tubes. B.…

A: Kidneys are the paired, bean-shaped organs that are located below the rib cage, one on either side…