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

Q: Which molecules are released from the dorsal blastopore lip in the blastula-stage embryo?     a.…

A:

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

A: Answer is a.)  toxin.

Q: Which of the following situations is the result of epistasis? a A mouse has black fur, black eyes,…

A: All the organisms have a hereditary currency. This currency is the gene. Genes are present in the…

Q: ......... is not developmental event in human and frog.   After fertilization rapid cycle of…

A: Fertilization is the event that marks the fusion of the female and male gamete which leads to the…

Q: A preembryo has:- a. A neural tube. b. A heart bulge. c. A cytotrophoblast. d. A coelom. e. decidual…

A: Cell denotes the primary structural and functional unit of all living organisms. Scientists…

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: which of the following a correct development sequence a. Neural plate, proliferation, neural…

A: The neural plate is a crucial developmental component that acts as the nervous system's foundation.…

Q: Virtually all steps of embryological development depend on: a. Alterations in the genome b. Tumor…

A: Embryological development is the growth and development of embryo by  cell division and cell…

Q: Which of the following represents the fertilization process for monozygotic twins? a. One egg is…

A: INTRODUCTION Fertilization is the joining of a paternal sperm nucleus with a maternal egg nucleus to…

Q: In species with environmental sex determination, a. sex is determined during development as an…

A: A sex-determination framework is a natural framework that decides the improvement of sexual…

Q: Premature babies born before the 26th week of gestation develop physiological problems because…

A: Fetal development within the womb is called prenatal development. It is a process that occurs in…

Q: The embryonic diska. forms between the amniotic cavity and the yolk sac.b. contains the primitive…

A: The continuation of species in the world is due to the process of reproduction, either sexual or…

Q: Which gene is incorrectly matched to its function?a. Hox—body shapeb. Pax6—body segmentationc.…

A: Hox genes are involved in laying out  a basic body plan. Pax6 gene is involved in the formation of…

Q: Birds, reptiles and insects have something in common as far as the development of their embryos.…

A: Answer :- Birds, insects and reptiles are higher vertebrate . All of these are developed from…

Q: A baby born four weeks before its due date is most likely to have anunderdevelopeda. central nervous…

A: The central nervous system begins developing two weeks after fertilization and continues developing…

Q: Which of the following rows correctly identifies the development of the germ layers? Select one:…

A: The germ layers are an embryonic collection of cells that aid in the creation and development of…

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: The parts of the limbs develop a. in a proximal-to-distal sequence. b. in a distal-to-proximal…

A: We know that The single-celled zygote, which is formed after the fusion of haploid male and female…

Q: Which of the following statements is FALSE? a. Only vertebrates possess HOX genes. b. HOX genes are…

A: The false statement is A only vertebrates possess HOX genes. Hox genes are homeotic transcription…

Q: The fast block to polyspermy in sea urchins (a) is a depolarization of the egg plasma membrane (b)…

A: The egg's blocks to polyspermy (fertilization of an egg by more than one sperm) were originally…

Q: 6. A male newborn has renal agenesis on the right. Which of the following primitive rudiments most…

A: Introduction:-  Renal agenesis is a rare condition in which one or both kidney are not present in…

Q: In animals, a key difference between spermatogenesis andoogenesis is thata. only oogenesis involves…

A: Reproduction refer to a biological process in which new organisms are produced from their parents.…

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: Suppose we would want to have mirrored lateral sides (meaning both the left and right portion are…

A: The majority of animals have bilateral symmetry. They have anterior-posterior (A-P) and the…

Q: Explain in details the ovulation period in female mammals... Example human being

A: The Duration of Female Reproductive cycle is typically ranges from 24 to 35 days. During…

Q: Which of the following statements about iPS cells is correct? O A. They are derived from embryonic…

A: Pluripotent stem cells keep promise withinside the discipline of regenerative medicine. Because they…

Q: Explain the developmental and functional similarities and differences between:   1. Avian yolk…

A: Three fetal membranes are present in mammals; yolk sac, amnion, and allantois. Yolk sac and…

Q: When genetic males lacked the enzyme that converts testosterone to dihydrotestosterone, what…

A: The correct option is B. They looked female at birth but developed male structures at puberty .

Q: Estradiol is found in high levels in the pregnant rat. This estradiol is prevented from affecting…

A: In the pregnant rats progesterone will be essential for the maintenance of the pregnancy along with…

Q: Which of the following correctly identifies the different phases of human development? Select one:…

A: Human development  It is the process of development of the human body , which begins with the…

Q: Internal and external fertilization both ……… occur only among birds. produce single-celled…

A: The question is asking us to identify a common characteristic between internal and external…

Q: Using the following list, describe the proper sequence for the events of animal development: 1.…

A: Animal development is occurs in sequential manner.

Q: The parts of the limbs developa. in a proximal-to-distal sequence.b. in a distal-to-proximal…

A: The single-celled zygote, which is formed after the fusion of haploid male and female gamete during…

Q: All of the following are true about humans EXCEPT: A. our zygote and early embryo cells have…

A: Introduction :- A zygote is a eukaryotic cell created when two gametes fertilise each other. The…

Q: Infants born 39 weeks or later are less likely to:   A. have problems with vision and hearing.   B.…

A: Infant: An infant is a very young child, typically under the age of one year old. The term "infant"…

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: D E Figure 42.11 Use the figure above showing human embryonic developmental day 14 to ans The…

A: Embryo is pre birth stage. It is formed just after fertilization and is followed by fetal stage. It…

Q: According to the video “The Biology of Skin Color”, how does folate deficiency affect fetal…

A: The question is asking about the impact of folate deficiency on fetal development according to the…

Q: Compare and contrast the three types of mammals with respect to fetal development and birth: the…

A: Fetal development begins with implantation when the sperm fertilizes the egg. At this point, the…

Q: The major development of organ systems takes place ina. weeks 1 and 2 of development.b. weeks 3–8 of…

A: We know that, Germinal period is the time during which the primitive germ layers form. It takes…