Protostomes and deuterostomes can be classified based ona. cleavage pattern.b. destiny of the blastopore.c. whether the fate of the embryonic cells is fixed early duringdevelopment.d. all of the above.

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

A:

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: What is the correct order of development in humans?   Question 4 options:…

A: Fertilization: Sperm fertilizes the egg, forming a zygote. Morula Formation: The zygote undergoes…

Q: Which of the following does not occur during cleavage?A. Rapid DNA synthesisB. Cell growthC.…

A: Step 1 Early development or embryogenesis is the development of an embryo from the fertilized ovum.…

Q: Sawfly larvae differ from Lepidoptera caterpillars | by having more prolegs. | by having…

A: Sawfly larvae ( belonging to order Hymenoptera) are immature stages of wasps or bees that have…

Q: The major organizing center of the gastrulating embryo is the A. Inner cell mass B. Primitive streak…

A: Note:- Sticking to our guidelines I have answered only ist three questions. Please ask rest of 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: A terrestrial animal species is discovered with the following larval characteristics: exoskeleton,…

A: The phylum is the division of Kindom in the process of classification of organisms in which the…

Q: Toxoplasma gondii: a. Have both sexual & asexual phases in its life cycle. b. Releases oocysts by…

A: Toxoplasma gondii is a protozoan and an intracellular parasite which is obligate and infects mostly…

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: make a concept map, to discuss how reproduction takes place in animals. (Include the modes, sexual…

A: Reproduction is the process through which which offspring are produced from their parents. Each…

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: During development, cells become a. differentiated before they become determined. b. determined…

A: The biological cell is the fundamental unit of life. It is a hub of metabolic activities. Numerous…

Q: Discuss all the processes involved in the development of the following organs: 1. Insect wing and…

A: The human body is considered to be comprised of different forms of organs responsible for performing…

Q: Answer the following questions about the Planaria: A. Answer True or False in the box provided:…

A: INTRODUCTION: Planaria is a free living type of flateworm of order Tricladida and phylum…

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: 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: C. Vestigial structures 34. The forelimbs of humans, horses, cats, and bats are considered to be…

A: The organs which have same anatomical structure but are different in function is called as…

Q: How many functional eggs (ova) result from one oogonium?     A. 1 and 3 polar bodies   B. 18…

A: In sexually reproducing organisms haploid gametes are produced. Female gametes are called eggs…

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

A: Answer is b.) amnion.

Q: . The ability of one embryonic tissue to influence the development ofanother tissue is calleda.…

A: Development biology is the branch of biology that deals with the growth and development of living…

Q: Organisms that lay eggs are said to bea. oviparous. b. ovoviparous. c. viviparous. d. placental. e.…

A: Meiosis produces the gametes like sperm in male and the ova in the female. When the male sperm comes…

Q: ____ genes are regulated by segmentation genes and control the development of specific structures…

A: 1 blank- Gap genes 2 blank- homeodomain

Q: Development of an animal is controlled by the genes that are expressed during development. What…

A: Hox genes are members of the homeotic transcription factor family that play a key role 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: In the development of amniotes (reptiles, birds, mammals), the defining feature of gastrulation…

A: Answer is : primitive streak The beginning of gastrulation is marked by the appearance of a groove…

Q: Describe the radiation in vertebrate forms from phylotypic stage by focusing on three groups of…

A: Evolutionary radiation increases biological diversity and is caused by various factors of which one…

Q: describe one way in which limb development in Acanthostega could differ from that in modern…

A: A group of extinct stem-tetrapods called Acanthostega was among the first vertebrates to exhibit…

Q: Explain SPIKES ? b. What are the steps of gaining an informed consent?

A: Patient-centered care has changed the face of healthcare delivery for good. Healthcare professionals…

Q: 36. Which of the following relies on the study of embryos as evidence of evolution? A. Comparative…

A: Which of the following relies on the studies of embryo as evidence of evolution?

Q: Embryo above pictured here is a/an O A. blastula O B. gastrula O C. planula O D. zygote

A: Human embryonic development refers to the development of embryo. It involves the process of cell…

Q: Give a brief description of the jaw patterns of the following: a.Chondricthyes b. Paleonisciform…

A: Jaw pattern in fishes: Most bony fishes have two sets of jaws made mainly of bone. The primary oral…

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 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: 9999 333 wikimedia commons Some embryos share many similarities and are difficult to tell apart,…

A: We know that Embryo is generated from the diploid zygote which is a result of fertilization of two…

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: The brain develops froma. ectoderm.b. endoderm.c. mesoderm.

A: The central nervous system includes the brain and the spinal cord. It is the site of information…

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: 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: 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: 20. The structure that attaches the mammalian embryo to the placenta is a. hypothalamus. b.…

A: Reproduction is the process of producing young ones from the parent.

Q: Homeotic genes aid in development of D. melanogaster by giving a specific identity to each segment.…

A: Insects are the invertebrate organisms which are the largest group in the arthropoda phylum. The…

Animal Diversity

Nematodes are commonly known as roundworms. They are free-living, very tiny organisms. They have an elongated and tubular body. These organisms have a nervous system and are mostly act as parasites to both animals and plants.

Platyhelminthes

Platyhelminthes are also known as "flatworms" because as they are dorsoventrally flattened from head to tail. They are invertebrate, soft-bodied, acoelomate, unsegmented and have bilateral symmetry.