State five derivatives of the neur crest?

Q: What is the chorioallantoismembrane present in theembryonic development ofreptiles and birds? How…

A: The chorioallantois or chorioallantoic membrane abbreviated as CAM is the vascular membrane that is…

Q: At which embryonic event would one be able to first distinguish a diploblastic embryo from a…

A: Answer: In reproduction process after the fertilization of female egg cell with sperm male cell…

Q: How similar is the genetic information within each blastomere?

A: Blastomere: Its is a stage in early embryonic development. It is 2 celled structure formed by first…

Q: What is a vestigial structure? What are some examples of vestigialstructures in humans and other…

A: Vestigiality is the retention during the process of evolution of genetically determined structures…

Q: What are the archenteron and the blastopore? What is the stage of the embryonic development in which…

A: Gastrulation is the phase in the embryonic development of animals. During this phase, the blastula…

Q: Give a short note on scales of Labeo?

A: Fish scale is a small rigid plate that grows out of the skin of a fish.  In most of the fishes, the…

Q: Describe the general events of embryonicdevelopment, and identify the end result of each.

A: Introduction: Embryonic development is also known as embryogenesis and forms the main part of the…

Q: what will the plumule become after the embryo grows? what will the radicle become after the embryo…

A: After the seed receives the necessary conditions for growth such as water, oxygen, right…

Q: elaborate on the relationships between the three germ layers in forming the mouth and facial…

A: The three main layer of body parts are ectoderm ,mesoderm and endoderm . We know that mouth is…

Q: Which is primarily a developmental task of middle age?

A: A life of a human starts from the womb of a mother as an embryo and later undergoes various stages…

Q: Explain the development of a feather?

A: The epidermal growths which form distinct outer covering or plumage in aves are known as Feathers.…

Q: Enumerate five (5) ways on how to track the routes of the neural crest cells.

A: Neural crest cells (NCC) are multipotent cells that are induced at the neural plate's edge and…

Q: Discuss the adaptions of Scoliodon?

A: Scoliodon is commonly known as Spiny Dogfish. It is a marine animal which has acquired many…

Q: State the neuromere origin of each brain region?

A: Introduction Neuromeres Are Known As The Segments Of The Neural Tube That Forms The Embryonic Brain…

Q: What are the features used to identify a male cockroach from a female cockroach?

A: Cockroaches are insects which also includes termites. They belong to kingdom-Animalia. About 30…

Q: How is the avian feather formed? What patterns the placement of the feather bud placodes?

A: To define patterns the placement of the feather bud placodes

Q: Name the two indicated structures below the arrow, seen here in the Pinus ovule.

A: Pinus is a tree that belongs to a group of plants known as gymnosperms. This plant is mainly…

Q: What are the development phenomenas occurs at the age after 11 years?

A: Humans have extremely long development stages compared to other animals due to the complex nature of…

Q: Explain C. elegans embryos.

A: Answer: Introduction: The nematode worm Caenorhabditis elegans is a minor and organized organism.

Q: Can diagnostic tests provide full information on the extentof effects of Down syndrome in an…

A: Chromosomes are made up of the strands of Deoxyribonucleic acid (DNA). This carries the genetic…

Q: How does the neural crest originate? What cells or tissues arise from it?

A: The neural crest arise at the time of embryonic development and these cells come by pinching off…

Q: Discuss the external characters of Columba?

A: Columba is a genus of the bird. It comprises the small and large pigeons. They are usually wood…

Q: What mechanism determines differentiation of fore limb VS hind limb?

A: Answer: Introduction: Limbs means legs and arms present in humans.Forelimbs that are present in the…

Q: Which ovary is functional in birds?

A: Ovary is the female reproductive organ found in lower chordates to higher animals. Ovary produces…

Q: Explain the eccentric position of the early frog blastocoel. (min. 5 sentences)

A: A zygote is formed during the embryonic development that occurs when the egg is fertilized by a…

Q: why do males typically have lower voices than females do?

A: The ability to produce voice begins with airflow from the lungs, which is coordinated by the…

Q: When is amniocentesis performed?

A: Fertilization is key process in sexual reproduction. When male and female gamete unites successfully…

Q: C. Explain the functions of the four layers found inside an amniotic egg.

A: Amniotic eggs are eggs that produce by mammals, birds, reptiles etc. The embryo development take…

Q: What is blastomeres?

A: Embryonic development is also called as embryogenesis. It is a process by which the embryo forms and…

Q: Explain briefly apical dominance. Name the hormone that controls it.

A: Plant growth regulators are chemicals that influence the growth and development of plans. They are…

Q: goat but are

A: introduction  knowledge of the peripheral nervous system and vertebral column anatomy is important…

Q: How Has Brain Volume ChangedOver Time in the HomininLineage?

A: Hominin are the primate species that are closely related to humans than chimps so they are…

Q: Describe the Amniocentesis procedure?

A: Amniotic fluid is a watery liquid formed from maternal plasma inside the amniotic sac of the…

Q: What is the first appearance of embryonic callus?

A: Callus is defined as an unorganized tissue mass growing on solid substrate. Callus forms naturally…

Q: What are the external characters of Labeo?

A: Labeo belongs to phylum chordata and sub-phylum vertebrata. It belongs to class teleostomi. Its…

Q: distinguish between hemimetablous and holometabolus development

A: Introduction: Metamorphosis is a biological process of the development of an animal. It involves…

Q: Name the two forms of homo erectus.

A: Homo erectus is an oldest species of archaic human. They were appearing during the Pleistocene (2…

Q: Name the four processes that are fundamental toanimal development, and describe each of them in a…

A: Animal development is a complex process where life begins from a single-celled zygote and becomes…

Q: Where do cleavage furrow form??

A: Mitosis is the phase in cell cycle where the division of replicated chromosomes into two new nuclei…

Q: What are the four initialstages of the embryonicdevelopment?

A: Answer: Introduction: Embryonic development is also known as embryogenesis, is the growth of an…

Q: Discuss the adaptations of Labeo?

A: Fishes are gill-bearing aquatic vertebrate animals. The earliest organisms that can be first…

Q: explain how polyspermy is blocked

A: Polyspermy is the fertilization of an ovum by more than one sperm. It is prevented by mechanisms…

Q: Describe the major features of the acanthocephalan body

A: Acanthocephala is a phylum of parasitic worms known as acanthocephalans, thorny-headed worms, or…