Identify one factor, besides genetic factors, that could influence the development of human offspring.

Q: Is the type and pattern of the cleave of an egg the same to all species of animals?

A: During the mitotic division, the cytoplasm of the egg is divided into multiple parts which then…

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: Which of the following is the correct order for the four developmental phases in animals? A.…

A: Animals are multicellular eukaryotic organisms that form the biological kingdom Animalia. With few…

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

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

Q: Why do mammalian eggs have a small concentration of yolk, while bird and reptile eggs have a large…

A: Eggs are divided into three types on the basis of the amount of cytoplasm present in them. They 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: Gametogenesis in mammals is a complex process. When comparing spermatogenesis and oogenesis,…

A: 1. After the S-phase the spermatogonial stem cell contain 2n chromosome but the amount of DNA is 4C.…

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: During embryonic development, which type of cleavage pattern leads to the development of a bird?…

A: In developmental biology, embryonic development, also referred to as embryogenesis, is that the…

Q: During the embryological development of chordates, the midline dorsal layer of ectoderm folds in on…

A: In humans (a chordate), by the end of the third week of gestation, three basic germ layers…

Q: Which of the following mammalian structures is derived from one of the extra embryonic membranes?…

A: Introduction An extraembryonic membrane is one of the membranes that aid in embryo development. Such…

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: Oviparity is the rule in the animal kingdom. It is common in insects, fishes, amphibians, and…

A: The expulsion of undeveloped eggs rather than live young is known as Oviparity. As in birds and some…

Q: Why are sea urchins have external fertilization? What are the adaptive advantages of external…

A: Sea urchins are significant herbivores on coral reefs, & in certain environments they assume a…

Q: In mammals, distinguish and differentiate the following germinal layers. Identify the organs that…

A: Introduction :- Mesoderm interacts with endoderm and ectoderm during organogenesis to give rise to…

Q: n the ventral surface of the embryo     series of tissue blocks lateral to the neural tube     a…

A: somures eventually differentiate into dermis, skeletal muscle, cartilage, tendons, and vertebrae.

Q: Which of the following occurs to the blastocoel during Xenopus development?     is replaced by the…

A: Xenopus It refers to the genus of highly aquatic frogs that are mostly found in the regions of…

Q: O Occurs in protostomes and involves mesodermal tissue that is located in the space between the…

A: Ans- Occurs in protostomes and involves mesodermal tissue that is located in the space between the…

Q: Which type of cleavage leads to the development of a bird?

A: Cleavage refers to repeated cell division in the fertilized egg. Cleavage leads to the formation of…

Q: Spermatogenesis and oogenesis

A: Oogenesis is the growth process where the primary egg cell or ovum becomes a mature ovum. There are…

Q: A A Mesoderm Ectoderm Endoderm In the above diagram, there is an opening that has appeared on the…

A: Developmental biology is the study of the process by which organisms grow and develop.

Q: In frog neurulation the notochord _______ the formation of the _______ in the ectoderm next to it.…

A: ANSWER) (a) expresses, neural plate

Q: Mammals have unique reproductive adaptations that have contributed to their evolutionary success.…

A: A temporary organ which connects developing fetus via umbilical cord to the uterine wall is…

Q: Most mammals, including humans have alecithal type of egg, which means that there is negligible or…

A: In lower organisms the yolk provides the nourishment to the growing embryo. But in mammals the…

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: Explain the following terms: ectoderm, endoderm, mesoderm and stem.

A: Animal phylogeny is a rapidly changing field. The biologists mostly depend on the fossils to compare…

Q: what evolutionary advantages does the amniotic egg have? explain how each component of the egg plays…

A: Allow embryos to grow faster and to a greater extent before hatching. Animals are no longer reliant…

Q: In embryos with spiral cleavage the 4d cell gives rise to which germ…

A: INTRODUCTION Mesoderm It is a germ layer formed during gastrulation. Present between ectoderm and…

Q: The diagram below represents one stage during the human reproductive process. Fetus A- A function of…

A: Implantation is the process by which the blastocyst or fertilized egg attaches to the uterine wall.…

Q: are the essential similarities and differences between the development of sperms and eggs in mammals

A: Both sperm and ovum are haploid having 'n' number of chromosome.  Both undergoes mitosis as well as…

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: Write a brief description of one cellular level event that could go wrong during the gastrulation…

A: Gastrulation stage of a zebrafish embryo. The outer dashed line represents the epidermis, while the…

Q: How would you explain the similarities among bird, mammal, and reptile embryos at the early stages…

A: Embryos for bird, mammal & repltile look alike at early developmental stages because they share…

Q: Compare the reproductive organs of reptiles and birds. How are their reproductive patterns…

A: Reptiles Reptiles are cold-blooded animals that have vertebral columns at their backs. These animals…

Q: Survival is all avoiding extinction and ensuring the genes are passed on to the next generation.…

A: Answer---

Q: How large (as a proportion of body size) should the testes of chimpanzee males be relative to…

A: The testicles are responsible for making testosterone, the essential male sex hormone, and for sperm…

Q: Describe and distinguish patterns of reproduction in monotremes, marsupials, and placental mammals.…

A: The mammals belong to the class Mammalia and the main feature of them are the presence of mammary…

Q: Which of the following statements is true: O invagiantion is folding of cells that happens early in…

A: Blastocoel is a fluid filled cavity in blastula. First the morula(60 or more cells) is formed then…

Q: In comparing external and internal fertilization, what evolutionary change can be seen in the coats…

A: In sexual reproduction, the process of fusion of two gametes to form a zygote is known as…

Q: Lactation and fur are synapomorphies that all mammals share. What else can we infer about lactation…

A: Synapomorphies are shared advanced characters.

Q: Which of the following correctly lists the germ layers of an embryo? O A. exoderm, mesoderm,…

A: Step 1 Embryonic development or embryogenesis is the development of the embryo from the fertilized…

Q: Mammals have unique reproductive adaptations that have contributed to their evolutionary success.…

A: Placental mammals and marsupial mammals are the two types of Therian mammals. Each community has a…

Q: Hermaphroditic animals can self-fertilize, except earthworms. Why? And is this an advantageous or…

A: Earthworms are invertebrate animals belonging to the phylum Annelida. the animals have tube-like…

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: What evolutionary changes occur to the egg covering between external and internal fertilization?…

A: Life first evolved with external fertilisation and later on internal fertilisation. Since, external…

Q: In animal phyla with radial cleavages, cell fate of the embryo is?

A: Radial cleavage is a developmental pattern of embryos where the cell division happens…

Q: Explain: Is the degenerating blastocoel visible in the frog gastrula? How much yolk protrudes…

A: Introduction :- In early mammalian embryos, a blastocoel is a chamber that is filled with fluids,…

Evolutionary adaptations

Evolutionary adaptation is the process through which organisms adapt or adjust to their surroundings to increase the chances of survival, mating, and reproduction. An organism's behavior, physiology, and structure are adjusted or changed to make it more suited to its environment.