ou find a flatworm during a field trip and discover that the embryos undergo spiral cleavage. What also must be true of this animal? (can be more than one anwser) E. regulative development B. mosaic development C. it is acoelomate D. All of these A. bilateral symmetry

Q: Fertilization is the first step in sexually reproducing species. A cortical reaction failure that…

A: Fertilization is the process of fusion of nuclei of two haploid reproductive cells, sperm (n) and…

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: This TRUE of enterocoely. O Results in the formation of coelom. O Results in processes in protostome…

A: Embryonic development refers to the development of a multicellular embryo from a fertilized egg.…

Q: an amniotic egg was crucial to the evolution of vertebrates because it provides the following to the…

A: The amniotic egg was the crucial evolutionary step that allowed the living organisms to breed…

Q: Which of the following statements about bilaterian animals is false? A. Many bilaterians are…

A: Bilateral symmetry refers to body shaped species which are mirror copies of a midline called the…

Q: (a) State two advantages of cephalisation (b) Outline the advancement features of reptiles that…

A: Cephalization is the differentiation of the anterior end of an organism into a definite head. This…

Q: Identify the characteristics of protostome development: Select one or more: O spiral cleavage…

A: Protostomes are organisms which shows formation of mouth before formation of anus during embryonic…

Q: The following diagram is of the blastopore stage of embryonic development. Based on the information…

A: Reproduction is the process by which an organism creates more of its own progeny. Reproduction is…

Q: Protostomes and deuterostomes can be classified based ona. cleavage pattern.b. destiny of the…

A: Metazoans are divided into two, depending upon the embryonic development : Protostomes and…

Q: !) Consider the Spemann-Mangold organizer in amphibian development. Which of the -llowing statements…

A: The spemann-Mangold organizer helps in amphibian development.

Q: astrulation, are there any evidences of cephalization? Why or why not?

A: Gastrulation: During gastrulation, cell motions cause the embryo to reorganise massively,…

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

A: Answer is d.) somites.

Q: A genetic change that caused a certain Hox gene to be expressedalong the tip of a vertebrate limb…

A: The genes in the living organisms which determine the positioning of the organs in the bodies are…

Q: What structural adaptation in chickens allows them to lay theireggs in arid environments rather than…

A: The vertebrate embryo requires an aqueous environment for their development. The amphibians and…

Q: Humans have a coccyx at the end of the vertebral column. What structure common to all vertebrate…

A: The coccyx is a triangular structure of bones near the bottom of the backbone, just below the…

Q: Which statement is true of Spemann’s organizer?a. It is unique to amphibian embryos.b. It arises…

A: Answer is a.)  it is unique to amphibian embryos.

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: Gastrulation in a mammal would be most similar to gastrulation in a. a gecko. b. a tuna. c. an…

A: Gastrulation is a process of rearranging the cells of blastula (blastomere) into three germ layers…

Q: a) List down subclasses of Gastropoda b) Snails are distinguished by an anatomical process known as…

A:

Q: Characteristics that evolved in birds to allow for flight includea. reptilian-like scales on the…

A: Bird anatomy has unique adaptations mainly in flight. These are light weighted organisms with very…

Q: Which of the following traits do human embryos possess? O A tail O Webbed fingers and toes O Gills O…

A: Embryology is the study of the development of embryos and by comparing these developing embryos of…

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: 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: Suppose you watch a video showing the development of an unknown animal. What clues can the…

A: Animals can be classified based on morphological characteristics (traits that can be observed after…

Q: . In humans, identical twins are possible because(A) extraembryonic cells interact with the zygote…

A: The identical twins are also referred to as monozygotic twins. This occurs from the fertilization of…

Q: Which of the following is common to the development of bothbirds and mammals?(A) holoblastic…

A: Birds are any warm-blooded vertebrate of the class Aves. Birds have forelimbs modified into wings, a…

Q: You find a flatworm during a field trip and discover that the embryos undergo spiral cleavage. What…

A: The daughter cells are positioned in the grooves of the parent cells in a spiral division. The…

Q: If radial cleavage occurs during development, the animal will be a deuterostome (True/False)?

A: Deuterostome in greek mean second mouth. It make a nephrozoa clade with protostomia clade. they are…

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: The ___________________ of an egg serves as an embryos water supply while the ____________ provides…

A: The correct option is C) albumen; allantois

Q: The cortical reaction of sea urchin eggs functionsdirectly in(A) the formation of a fertilization…

A: Sea urchins are the globular animals that belong to the class Echinoidea. They come under the…

Q: Choose the correct statement w.r.t. Periplaneta a.In female cockroach, sperms are stored in…

A: The American cockroach, Periplaneta americana (Linnaeus), is characterized by the largest of the…

Q: What is NOT true about embryo development? A. a morula is an earlier stage than a gastrula B.…

A: Zygote is a structure formed by the fusion of male and female gamete. The stage of development of…

Q: One of the characteristics unique to animals is(A) gastrulation.(B) multicellularity.(C) sexual…

A: Organisms are open systems that maintain homeostasis, are composed of cells, have a life cycle,…

Q: The folding of ectoderm on the top of the embryo during organogenesis produces...? Group of answer…

A: In humans, the folding of neuro-ectoderm gives rise to one of the most important structure i.e…

Q: The egg of a fish is what type of chordate egg and why? a. isolecithal b. telolecithal with total…

A: All fish eggs are surrounded by using an envelope, referred to as the zona pellucida (ZP), that…

Q: Among living animals, only birds have_____ . a. a cloaca c. feathers b. amniote eggs d. a…

A: Introduction :- The tissue that will become the female fetus's intestinal, genital, and urinary…

Q: The jelly like substance found between ectoderm and endoderm in Cnidarians is called the ___

A: Cnidarians are marine animals that belong to phylum Cnidaria and they have radial or biradial…

Q: Mammals belong to a group of amniotes known as synapsids. Three major lineages of mammals had…

A: Mammals These organisms belong to the amniotes in which the embryo grow within protective…

Q: The embryos of complex multicellular animals must establish spatial coordinates if development is to…

A: To find   The reference coordinate for developing frogs for the development to proceed

Q: Observation of the development of embryos in sea stars shows the mesoderm forming pouches bulging…

A: Sea star classification: Kingdom       :      Animalia Phylum          :      Echinodermata…

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

A: In development biology, cleavage is the process (following fertilization) that involves a series of…

Q: Draw a diagram that includes the various characteristics of protostome development: bilateral…

A: Protostomes belong from phylum invertebrate in which mouth originate prior to anus during the…

Q: An additional notochord is grafted next to the developing neural tube. Answer the following…

A: The neural tube is an embryonic structure that eventually leads to the formation of the brain and…

Q: From which of the following is the embryo developed? a) Trophoblasts b) Blastocoelen c) The…

A: In humans the period of pregnancy is about 39-40 weeks. This is called as gestational period. During…

Q: Address the items below as they relate to human embryology; a) discuss when the germ layers of…

A: The study of the development and formation of an embryo is known as human embryology. The study of…