Researchers searched for an activator of neural tissue formation. What is the real pathway for this developmental phenomenon? a. Neural tissue formation occurs via BMP inhibition by proteins secreted from the organizer. b. Noggin activates ectoderm to become neural tissue. c. Nodal activation induces mesoderm to make neural tissue. d. Beta-catenin is required for formation of neural tissue.

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

A:

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…

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

Q: Group of answer choices a. control of formation of the dorsal/ventral axis in the chick b. control…

A: The zone of polarising activity ZPA is a specialised area of mesenchyme in chick embryo.

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.…

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A: The fusion and fertilization of parental sex gametes give rise to a zygote. A zygote is the first…

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A: FGF plays important role in distal part of the limb development in tetrapods Retinoids acid is at…

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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: How is colostrum most important to a newborn?a. It helps boost the newborn’s immune system.b. It…

A: Immune system is a complex organization of cells, tissues, and organs. The immune system important…

Q: At what stage uteroplacental circulation started?  a.Maternal blood entering the lacunar  b.Embryo…

A: The uteroplacental circulation is a circulatory framework where two circulation systems, the fetal…

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: Generate a hypothesis that may explain how contact by a sperm to the outside of the cell membrane of…

A: Calcium is stored in large amounts in endoplasmic reticulum and is released at the time of sperm egg…

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 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…

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

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

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Q: In an embryo from a homozygous Bicoid mutant female,which class(es) of gene expression is (are)…

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Q: Which statement about Hox genes is false?   a. They are expressed in similar patterns in the…

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Q: Expand on the sentence "both activation and inhibition are involved in embryonic development."…

A: Embryonic development is also named as embryogenesis . There are following steps . The embryonic…

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 .

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

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A: During the development of a chick embryo, Blastodisc growth occurs only in a small area of the egg.…

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Q: Explain how Hox gene expression affects vertebrate development.

A: Hox genes are a set of transcription factor genes that are responsible for the development of…

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

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

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Q: What is one of the ethical issues related to using embryonic stem cells? O A. Embryonic cells are…

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Q: During which stage of pregnancy will folate supplements lower the incidence of neural tube defects…

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Q: Give two ways nature uses to hide differences between X- and Y-sperm in mammals?

A: Most cells of the mammals contain both an X and a Y chromosome, but in the process of…

Q: A mammalian embryo puts the trophoblast into a hurried frenzy before it decides to proceed to the…

A: Trophoblasts refer to the cells that produce the external layer of a blastocyst. They can be seen…

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

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A: Introduction  An organ that grows in the uterus during pregnancy is the placenta. A developing…