Mammals have unique reproductive adaptations that have contributed to their evolutionary success. One of the distinguishing characteristics of mammals is their mammary glands, which allow for the production of milk. Even the more primitive mammals, such as the duck-billed platypus and the kangaroo, have some type of mammary glands. However, only the placental mammals (e.g. humans, horses, dogs) have a placenta, which supports the internal development of the embryo. The most primitive mammals have no placenta and can’t support the internal development of the embryo. Describe one advantage for an offspring to develop internally as opposed to developing externally (this means inside vs. outside the female’s womb/body)

Q: Compare and contrast the oogenesis and spermatogenesis in zebrafish and drosophila melanogaster

A: Here we will compare and contrast the processes of oogenesis and spermatogenesis in two model…

Q: ......... is not developmental event in human and frog.   After fertilization rapid cycle of…

A: Fertilization is the event that marks the fusion of the female and male gamete which leads to the…

Q: The first “milk” the mother produces is called ______________. After an egg is fertilised it is…

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Q: What is delayed implantation? Why is it important in marine mammals?

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Q: Contrast developmental activities in embryos before and after they reach the mid-blastula…

A:

Q: How do the shape and structure of the uterus of the fetal pig compare with that of the human?

A: Reproductive system is used for the sexual reproduction. Female internal reproductive organs include…

Q: Define about  Spermatogenesis and oogenesis in mammals. ?

A: As we know all living organisms are made of  basic unit of structure and function called as cell.…

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A: In Males there's have one or two penises that pass sperm from their cloaca to the cloaca of a female…

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Q: The development of sex and gender is a good example of a developmental cascade because:   Group of…

A: Developmental Cascade:  Developmental cascades refer to collective influences on the development of…

Q: Describe the biological basis for the 1 : 1 ratio of malesand females at conception in mammals.

A: The reproduction mode in the mammals is sexual with fertilization of the male and the female gamete…

Q: What will guide them to make the right decision?  Do they have a choice?

A: Answer: 1.trophobalst or icm if cells choose to become they will end up in the placenta and if they…

Q: Compare and contrast the oogenesis and spermatogenesis in chicken and drosophila melanogaster

A: Spermatogenesis is the process of the formation of haploid stem cell known as spermatogonium. The…

Q: Describe the process of germ cells migration in mammals.

A: The line of germ is that the sex cells (eggs and sperm) employed by genetic material to transmit…

Q: Birds, reptiles and insects have something in common as far as the development of their embryos.…

A: Answer :- Birds, insects and reptiles are higher vertebrate . All of these are developed from…

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: Why are blastomeres in the pigmented part of the egg smaller and more numerous than in the…

A: The other terms associated with developmental biology include embryogenesis or embryology. This…

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…

Q: Complete the following table with the organs/systems that arise from each of the germ layers Germ…

A: There are three embryonic germinal layers that covers the embryo. The outer layer is called…

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

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

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A: Gastrulation is a process during embryo development where the zygote undergoes cleavage and forms a…

Q: Explain in details the ovulation period in female mammals... Example human being

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Q: What mechanisms have evolved in animals with(a) external fertilization and (b) internal…

A: The process that involves fusion of the male and female gametes namely sperm and ovum respectively…

Q: Explain the evolutionary advantage of the amniotic egg

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A: Egg cells are the largest of all the cells in our body and are about 100 microns in diameter. It is…

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A: The question is asking us to identify a common characteristic between internal and external…

Q: By the end of gastrulation the [Select] * has surrounded the outside of the embryo, the [ Select ]…

A: Gastrulation refers to the process by which a gastrula is formed from a blastula. Grastrula is the…

Q: Compare and contrast gametogenesis in starfish and sea urchin. Please make sure that the answer is…

A: Gametogenesis is a biological process that involves the production of gametes or germ cells in an…

Q: Whether the statement "Because of the many later developmental transformations that produce the…

A: Gastrulation is the process by which the blastula develops into the three-germ layered gastrula.…

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

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Q: Early human embryos have both male and female reproductive tissues but, by the time they are born,…

A: The intermediate mesoderm is responsible for the development of the reproductive organs. The adult's…

Q: Neurulation in model vertebrates and in fly follows soon after gastrulation. Do vertebrates and…

A: "The development of the nervous system is a complex process that occurs during embryonic development…

Q: In the provided image (whole mount of 33-hour chick embryo), color the respective germ layers and…

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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…

A: Embryo is pre birth stage. It is formed just after fertilization and is followed by fetal stage. It…

Q: Compare and contrast the three types of mammals with respect to fetal development and birth: the…

A: Fetal development begins with implantation when the sperm fertilizes the egg. At this point, the…

Q: Compare how the germ layer derivatives develop in mammals and reptiles.

A: A germ layer is a multilayered cell that develops throughout the embryonic development process.…

Q: What four types of cellular processes must occur to enable a fertilized egg to develop into an adult…

A: Pattern development is the cycle by which a particular cell, the treated egg, partitions to offer…

Q: Female mammals undergo continuous reproductive cycles during their reproductive life. In the sense…

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Q: Tabulate all the differences between frog and mammalian ovaries, frog and mammalian oogenesis

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Q: A human with the SRY gene would: a produce eggs during gametogenesis b have…

A: SRY gene is responsible for the initiation of male sex determination in mammals.

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.