What are the consequences of the differences in the yolk amount and distribution of eggs among animals?

Q: Is the embryonicdevelopment in birds direct orindirect?

A: Animal developmental process can be direct or indirect. Direct development: It refers to the…

Q: Name the process of development of egg into young one without fertilization?

A: The above-mentioned definition is true for parthenogenesis. It is a type of asexual reproduction…

Q: consider a pig that has only fully formed ovary. how would this affect the pig's future…

A: Anything the gilt encounters before its first mating has the potential to influence its reproductive…

Q: What are three notable features between the fertilized and unfertilized egg?

A: Sperms and eggs are the gametes produced by male and female animals respectively in sexual…

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.…

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 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: Illustrate an egg in the morula stage. How does its size compare with that of the fertilizied egg?

A: MORULA STAGE OF EGG- It is an early stage of embryo consisting of 16 cells called blastomeres  which…

Q: How does oviposition occurs in female turtles. Provide the pathway involved in the oviposition…

A: Answer :- As we know that Males have a couple of penises that pass sperm from their cloaca to the…

Q: What experimental evidence demonstrates that molecular gradients in the egg control development?

A: Morphogens:          A substance that standardize a graded distribution and elicit distinct cellular…

Q: what is the chromosomal system for determining sex in mammals?

A: Chromosomal determination of sex It is also known as allosomic determination of sex and is based on…

Q: What are the notable features of the fetuses of penguin, panda, and snake that they have in common?

A: Vertebrates include five major classes i.e., Pisces, Amphibia, Reptilia, Aves, and Mammalia. They…

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

A: Answer is b.) amnion.

Q: How does the difference in size and cellular contents between spermand eggs relate to their specific…

A: Ovum is the female gamete, in which the cells are rounded spheres and non-motile, and they are not…

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: As discussed in the introduction to this chapter, sex in bearded dragons is determined by both sex…

A: The sex determination system regulates the development of sexual characters in any organism.…

Q: Describe the four membranes in the avian egg. How does EACH membrane affect the developing embryo?

A: Avian egg development.

Q: Explain how egg rotation and gravity determine anterior posterior patterning in chick embryos

A: Anterior posterior pattern formation is the regionalization process in which specific areas of cell…

Q: How do the two kinds of mammalian reproductive cycles— estrous and menstrual differ?

A: Fertility is more tightly regulated in the female then males. Female placental mammals have one or…

Q: Compare and contrast the mechanisms of egg activation in internal versus external fertilization.

A: Fertilization is part of sexual reproduction, responsible for the fusion of gametes. In case of…

Q: What is the evolutionary significance of parthenogenesis in the class insects?

A: Parthenogenesis is a type of asexual reproduction in which the offspring develops from unfertilized…

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: 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: Which ovary is functional in birds?

A: Ovary is the female reproductive organ found in lower chordates to higher animals. Ovary produces…

Q: What was important about the development of the egg as a part of the reproductive cycle of animals?…

A: Yolk formation in humans

Q: . How does the fertilization envelope form in sea urchins?What is its function?

A: Sexual reproduction is a type of reproduction that involves a complex life cycle in which a gamete…

Q: Why is it more difficult to determine the sex of a newlyhatched canary than a newborn puppy?

A: A sex-determination mechanism is a physiological system that controls how an organism's sexual…

Q: Which tissue type or organ is correctly matched with its germ layer tissue? A) nervous–mesoderm B)…

A: Introduction :- The mesoderm is a germ layer that develops between the ectoderm, which produces skin…

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: 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: Give two ways nature uses to hide differences between X- and Y-sperm in mammals?

A: Most cells of the mammals contain both an X and a Y chromosome, but in the process of…

Q: Both monotremes and marsupials lay eggs. have some embryonic development outside the uterus. are…

A: Introduction :- Mammals are divided into three types :- Monotremes , marsupials and mammals etc. The…

Q: How does von baer's law of development relates with the development of the frog embryo? evidences?

A: Von Baer's laws of development These are rules proposed by Karl Von Baer. The laws demonstrates the…

Q: Is a zygote a fertilized egg?

A: Fertilization is the process whereby gametes from each parent fuse to produce a new cell.

Q: How does amount of yolk affect cleavage? Compare cleavage in a sea star with that in a bird

A: Fertilization is the process of fusion between haploid male and female gametes to form diploid…

Q: Is parental care of a species a factor that affects embryological development? If so, how?

A: Embryological Development -- Embryological Development also called as Embryogenesis a complicated…

Q: explain Three egg types in variegated four-o’clocks.

A: Four o clock plant or Mirabilis jalapa refers to the perennial bushy flowering plants. These plants…

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: 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: What is the difference between the testes of shark and frog?

A: Testes are the male reproductive organ that is responsible for producing spermatozoa or male…

Q: What is the importance of the pharyngeal pouches in development? Discuss.

A: In embryology, pharyngeal pouch is defines as "any of a series of evaginations of ectoderm on either…

Q: What are two important differences between the processes of spermatogenesis and oogenesis in…

A: The process of formation of gametes is called as gametogenesis. In the diploid organism, the gametes…

Q: How many egg nuclei will be obtained from 200 megaspore mother cells?

A: Introduction A megaspore mother cell, also known as a megasporocyte, is a diploid cell in plants…

Q: What occurs in the female after fertilization of the egg? What happens if the egg is not fertilized?

A: The menstrual cycle refers to the monthly series of changes that a woman's body undergoes in order…