Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
SEXUAL REPRODUCTIONYou must be aware that reproduction is one of the distinguishing features of living beings. Reproduction is basically of two types: asexual and sexual. In asexual reproduction an organism propagates itself without the formation of sex cells or gametes. Sexual reproduction is more complex than the asexual type. It is based on the production of two kinds of gametes, the male and the female. The gametes are microscopic and in order that they fuse, certain specific conditions are required. This makes sexual reproduction so very specialised.
You may question why a complex and difficult mode of reproduction is found in nature when a simpler mode is available. It is because, an offspring that has been produced asexually has exactly the same genetic constitution Like that of its parents. Asexual reproduction necessarily involves mitosis which is a conservative process maintaining the status quo ante of the genetic material. On the other hand, sexual reproduction causes genetic variability in offspring. This is due to meiosis which is an essential component of sexual reproduction. Meiosis generates enormous variation through dependent assortment ofh omologous chromosomes and crossing-over. In addition, randam fusion of gametes at the time of fertilisation also contributes in generating variation.
You may recall that genetic.variability is a precondition for biological evolution. A species that is unable to evolve would sooner or later become extinct. Sexual reproduction hence is seen in a majority of existing forms of life to bring aboutvariability. To ensure a sexual mode of reproduction, most organisms have evolved different 'mating types' or 'sexes'.
In nature there is a vast array of diverse mechanisms of sex determination in different species.
Oleic - Linoleic Fats Fats in this group are the most abundant. The oils are all of vegetable origin and contain large amounts of oleic and linoleic acids, and less than 20%
who proposed trinomial nomenclature
Define
Which is the plant tissue responsible for the filling of the space between other tissues? The plant-filling tissue is generically known as parenchyma. The plant parenchyma can
Intermediate filaments - Role of Cytoskeleton Structures These filaments are intermediate in size among microtubules and microfilaments and are 10 nm in diameter. Five classes
Calculate the molar concentration of illinic acid and of its conjugate base illinate ion (in moles/L; M) in a 0.002 M illinate buffer at pH 12.0. The pKa of illinic acid is 6.7. En
Explain Procedure for Separation of Amino Acids by Paper Chromatography? Now carry out the procedure following the steps given herewith: 1. Take a circular Whatman No 1 filt
GAS T RUL A TIO N - Morphogenic movements are occured. 3 germinal layers are formed. Ectoderm, endoderm & mesoderm. Endoderm is formed first. Mesoderm is formed in the
Q. Show the process of Chemotaxonomy ? Chemotaxonomy is a science which uses chemical information as a character for taxonomic purposes. Before we analyse the basis of this mod
Define the Cooper's Run (12 minute run) Method? To undertake this test, a 400 metre running track is required-marked every 100 m and a stop watch. The test comprises of noticin
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd