Name four reproductive barriers and indicate whethereach is pre- or post-zygotic.

Q: What are the different Pre-zygotic and Post-Zygotic Reproductive Barriers?

A: Acvording to our guideline we can answer only the first question with three subparts. You hava…

Q: Why does sexual reproduction present a special problem for burrowing or sessile animals and…

A: Parasites like tapeworms are hermaphrodites in nature i.e., male and female sexual organs in the…

Q: a) Describe how coelom-status impacts the process of organogenesis. b) How do organs develop and…

A: During gastrulation, three germ layers develop, namely. ectoderm, endoderm, and mesoderm.…

Q: Define about Oogamy in Albugo ?

A: Albugo belongs to family ALBUGINACEAE. The taxonomy of this genus is not fully cleared as many treat…

Q: Which of the following steps of sea urchin fertilization initiates the formation of the…

A: Fertilization is the union of male ( spermatozoa ) and female ( ovum ) gametes which results in the…

Q: Draw the H. diminuta egg and adult

A: Hymenolepis diminuta is a parasite that causes Hymenolepiasis. It is also known as rat tapeworm. It…

Q: Draw the structure of asterias and ophiura?

A: Asterias: Asterias is also known as starfish. They belong to phylum Echinodermata and class…

Q: Explain the preferable microscope settings for studying fertilization & maturation in Ascaris eggs.

A: Ascaris is infection to human where Fertilized and unfertilized Ascaris lumbricoides eggs are passed…

Q: Why do you suppose a male attaches permanently to the female in this species?

A: When compared to females, males are smaller and during their early development, they get attached…

Q: Write a short note on fertilization in Riccia ?

A: These plants are small and thalloid, meaning they lack root, stem, and leaf differentiation. The…

Q: Write a note on mode of fertilization in Selaginella.

A: Selaginella is the only life genus from the Selaginellales  order and is generally referred to as…

Q: Differentiate between Geitonogamy & Allogamy.

A: Geitonogamy: The transfer of the pollen grains from the anther of a flower to the stigma of the…

Q: Differentiate between planogametic copulation and gametangial copulation.

A: Sexual reproduction takes place by fusion of two nuclei originating from two individuals of opposite…

Q: Describe and label a nematocyst and the cell containing it. Describe how nematocysts fire. How does…

A: Nematocysts are characteristic features of Cnidarians. These specialized cells are used for…

Q: Explain the process of fertilization in Selaginella.

A: Selaginella is the only life genus from the Selaginellales order and is generally referred to as…

Q: The dauer stage of worm development occurs:   1) when there is ample food   2) when there is…

A: Worms are the organisms of the animal kingdom that lack eyes and limbs. they have a cylindrical…

Q: What kind of cleavage pattern characterizes snail development? Describe its orientation.

A: Snails, earthworms and flatworms are remarkably different animals, but they all exhibit a very…

Q: Sexual reproduction ________. A) allows animals to conserve resources and reproduce only during…

A: Sexual reproduction is a beneficiary phenomenon that provides constant supply of unique organisms…

Q: Briefly explain post zygotes barriers to reproduction and list an example.

A: Given: Reproductive isolation is a collection of mechanisms physiological processes and behaviors…

Q: What are some reproductive changes that may be adaptive in the face of parasitism?  Why may males…

A: Males may have higher rates of mortality due to parasites than females for several reasons. One…

Q: Giving details diagram the process of tetrasporic megagametogenesis. Give full details

A: INTRODUCTION      It is a process of maturing female gametophyte in plant production. In the female…

Q: adaptive advantage of oogamy

A: Oogamy is the advanced form of heterogamy also called Anisogamy . In such sexual reproduction the…

Q: Give the role of membrana semilunaris in pigeon?

A: Doves and pigeons are diverse groups of birds. There are many muscles in pigeon and each muscle has…

Q: Define the terms invasive and metastatic and givean example of each from the reproductivedisorders.

A: The reproductive system (genital system) is one of the major organ systems in the body that includes…

Q: In a sponge, reproduction is: Individuals have both male and female reproductive systems. a. O b.…

A: sponges comes under phylum porifera , these are asymmetrical , multicellular pore bearing animals .

Q: Give a short note on Hibernation of Rana?

A: Hibernation is a state of minimal activity in which the animals conserve their energy in order to…

Q: Give a short note on the reproductive system of Rana?

A: Reproductive system or the genital system includes all organs and their related structures that…

Q: Sketch an embryo developing in an archegonium. Indicate to what generation each belongs and whether…

A: Archegonium is the female reproductive organ in ferns and mosses (pteridophytes and gymnosperms and…

Q: Is the stage when an insect larva is within a cocoon a stage of total biological inactivity?

A: The process by which an animal physically develops after birth or hatching undergoing abrupt changes…

Q: Draw samples of zygomycotes.label and describe the structures  identify sexual and asexual stages.

A: Members of ztgomycetes are mostly terrestrial in habitat, living in soil or on decaying plant or…

Q: Write a brief summary of the Spotted Lantern Fly. Make sure to include it's role and interspecies…

A: Introduction: In Pennsylvania, the Spotted Lanternfly (Lycorma delicatula), which is endemic to…

Q: Explain the sexual dimotrphism in cockroaches.

A: Cockroaches are the insects that are in close association with the human habitat.

Q: Describe an example of each of the following: a pre-zygotic barrier to reproduction a post-zygotic…

A: A pre-zygotic barrier to reproduction refers to any factor that prevents fertilization from…