Q: hy is it that the first trimester of pregnancy the most critical in humans? How will you relate it…
A: It is the early phase of pregnancy. The first trimester is marked as 1st day after your last period…
Q: The location of a cell during gastrulation plays a role in determining the cells fate in the…
A: The process of embryonic development during which the embryo having a single layer of cells called…
Q: In a developing chicken embryo, what mesoderm lines the amniotic cavity?
A: The amnion, chorion, yolk sac, and allantois are the four extraembryonic membranes found in amniotes…
Q: Where does fertilisation occur in human beings?
A: Fertilization is the process by which occurs when the male and the female gametes fuse together to…
Q: What is yolk? What is its role in fertilization and development?
A: The development of organisms depends on the supply of resources. In embryo development nutrition of…
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: what are three difference between mammals and frog testis?
A: The architecture of human urogenital tracts differs dramatically from that of all other animals. The…
Q: Investigate how the mass of the inert yolk affects reptiles, mammals and amphibians gastrulation
A: The development of multi-cell organic entities starts from a single celled zygote, which goes…
Q: The yolk sac is connected to the embryonic _____ by way of the vitelline duct. a. liver bud d.…
A: The yolk sac is connected to the embryonic _____ by way of the vitelline duct.
Q: In a reptile egg, the extraembryonic membrane thatencloses the embryo in a watery environment is…
A: Answer is b.) amnion.
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: Of all birds, the flightless kiwi has the highest proportion of yolk in its eggs and the longest…
A: Eggs are the products of fertilization and house the developing embryo .
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: What are some of the uses for the yolk from the fleece of a sheep?
A: Sheep are quadrupedal, ruminant warm blooded creatures normally kept as domesticated animals. Like…
Q: How is an egg (oocyte) prepared during oogenesis for fertilization? Why is preparation essential to…
A: Oogenesis is defined as the process by which the female sex cells or ova or egg cells are produced.…
Q: Does the distribution of Ca²+ in an egg correlate with formation of the fertilization envelope?
A: During fertilization, sperm-induced rise in cytoplasmic Ca2+concentration.
Q: If Ca2+ from the egg’s endoplasmic reticulum is responsible for the cortical granule reaction and…
A: Reproduction is the process of production of own kinds.
Q: Newborns are at much higher risk for dehydration thanadults. Why?
A: A baby which is 2 months old from his or her birth is considered newborns.
Q: After fertilization a developing embryos goes through several changes. At about 2-3 days, what is…
A: During fertilization the haploid gametes, that is, sperm from a male and secondary oocyte from…
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: Briefly explain how and why the yolk distribution in mammalian eggs has changed from their…
A: According to Bartleby expert, when multiple questions are posted we are allowed to answer the first…
Q: What distinguishes an amniotic egg from eggs laid by other animals, including fishes, amphibians,…
A: Amniotic eggs are eggs layed by reptiles and birds. The organisms which lay these eggs are called…
Q: Sperm whales have a specialized spermaceti organ in their head cavities filled with wax cetyl…
A: Every species is different from another due to some special characters. This is the reason behind…
Q: what is the process which involves in the self-destruction of cells in the developing embryo as…
A: Ans: The process which involves the self destruction of cells in the developing embryo is very…
Q: Which mechanism prevents an ovum from being fertilized by multiple sperm cells? A. Once a sperm…
A: An egg should be prepared by only one sperm in particular. To forestall polyspermy, the zona…
Q: Gestation of an animal can be as long as over two years (rhinoceros – 840 days) so, how does the…
A: Pregnancy begins with the fertilization of an egg and continues through to the birth of the…
Q: The egg travels from the ovaries to the uterus via the ?????
A: Female reproductive system consists of organs and glands which are involved in reproduction Female…
Q: How is the yolk formed in terms of embryogenesis
A: Embryogenesis is the course of improvement of an undeveloped embryo from the zygote. In…
Q: n your own words: Expound how the mass of inert yolk influences gastrulation in amphibians,…
A: In evolutionary biology, evolutionary developmental biology is considered a new norm. It developed…
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: How many somites are there in mouse? In chicks? In humans
A: In embryology, a somite is among a series of longitudinal blocklike sections into which the…
Q: Regarding mammals, amphibians, and reptiles, explain thoroughly in what way does the inert yolk's…
A: Evolutionary developmental biology is considered a new norm in evolutionary biology. It arose from…
Q: What is the third layer that forms as a result of gastrulation in some animals? mesoderm endoderm…
A: Gastrulation is the cycle during early stage advancement that changes the incipient organism from a…
Q: What are the defferent mechanism the egg employed to ensure that only one sperm cell will fertilize…
A: Polyspermy is a fatal condition in which several sperm nucleus engage with the female nucleus.…
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: What is the fate of the four extraembryonic membranes in embryos of placental mammals?
A: Any of the tissues, derived from the fertilized egg, that encase or in any case add to the help of…
Q: (a) Starting with a fertilized egg (zygote), a series of five cell divisions would produce an early…
A: We are answering the first question only. For the rest of the questions please repost. A zygote can…
Q: What are the consequences of the differences in the yolk amount and distribution of eggs among…
A: The amount and distribution of yolk inside the egg decides the pattern of cleavage. The type of…
Q: During the embryonic developmen, the trophoblast will developed into Select one: A. The embryonic…
A: Developmental biology focuses on the study of developmental sequences of organisms. The embryonic…
Q: What happens in the process of fertilization in animals and humans?
A: The cells of the biological unit of life. the cells comprise tissues which collectively forms an…
Q: What is the food needed by dogs? How do they obtain their food? How do they perform reproduction?…
A: Dogs are the organisms that belong to the kingdom animalia and to the class mammalia. Dogs are the…
Q: Why does it make sense for females to make only one egg cell every time meiosis occurs?
A: Meiosis is the reductional cell division that occurs in the organisms reproductive organs to produce…
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: 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,…
Why do mammalian eggs have a small concentration of
yolk, while bird and reptile eggs have a large
concentration of yolk?
Trending now
This is a popular solution!
Step by step
Solved in 2 steps
- How does amount of yolk affect cleavage? Compare cleavage in a sea star with that in a birdUsing sea star embryos as an example, describe gastrulation. Explain how the mass of inert yolk affects gastrulation in frog and bird embryosIf it takes just one sperm to fertilize an egg,why do males make so many?
- Describe the gastrulation by using embryos of the sea star as an example.And describe the way in which the mass of inert yolk influences the gastrulation in bird and frog embryos.Where does the fertilization of a human egg normally take place?Explain: Is the degenerating blastocoel visible in the frog gastrula? How much yolk protrudes through the blastopore of a frog gastrula How much yolk protrudes through the blastopore of a frog gastrula? Chickens lack a larval stage. How do they compensate for this?
- Hermaphroditic animals can self-fertilize, except earthworms. Why? And is this an advantageous or disadvantageous trait to the earthworms?Regarding mammals, amphibians, and reptiles, explain thoroughly in what way does the inert yolk's mass affects their gastrulation?Explain the way in which the yolk amount affects the cleavage. Compare the Cleavage in a sea star and bird.
- Of all birds, the flightless kiwi has the highest proportion of yolk in its eggs and the longest incubation time. Explain why birds with the longest incubation times have the yolkiest eggs.What are the stages of egg cell development in humans?Investigate how the mass of the inert yolk affects reptiles, mammals and amphibians gastrulation