Evidence in favour and against of mutation theory, Biology

EVIDENCE IN FAVOUR OF THE MUTATION THOERY -

Mutation theory can explain both progressive and retrogressive evolution and the occurrence of both changed and unchanged forms.

Example of Mutation

1. Ancon sheep is a short lagged variety, which appear suddenly.

2. Development of hornless cattle from homed cattle.

3. Hairless cats and double toed cats have developed through mutations.

4. Development of delicious Apple, Noval orange, Red sunflower.

EVIDENCES AGAINST THE MUTATION THEORY -

1.       The mutation are rare occurrence. Hence it is doubtful all new character shown by animals and plants could appear by mutation.

2.       Evening Primrose of de Vries was not a normal plant but a complex heterozygous form with chromosome aberrations.

3.       Mutations are mainly retrogressive or negative.

4.       Mutations are generally recessive while traits taking part in evolution are usually dominant.

5.       Mutation theory can't explain the development of mimicry, mutual dependence of flowers and pollinating insects.

6.       Mutation theory does not explain the role of nature.

Posted Date: 10/9/2012 1:28:20 AM | Location : United States







Related Discussions:- Evidence in favour and against of mutation theory, Assignment Help, Ask Question on Evidence in favour and against of mutation theory, Get Answer, Expert's Help, Evidence in favour and against of mutation theory Discussions

Write discussion on Evidence in favour and against of mutation theory
Your posts are moderated
Related Questions
Basic Planes of Cleavage The basic planes along which the egg and its daughter blastomeres are divided during early cleavage are: A. Meridional Plane - the cleavag

What are the antigens and the respective antibodies of the ABO blood group system? The ABO blood system contain the erythrocytic antigens A and B that can be attacked by the an

Importance of Forests - Fuel Wood The forests are renewable resources which provide us a wide variety of commodities. For man, forests have been a source of recreation and the

Economic Status Economic Status  :  It is one of the important practical considerations to be kept in mind while  formulating  a diet prescription. During  an acute illness, a

Involution - Internalization of Mesoderm As by now mentioned, in the frog Xenopus (and probably in other amphibian species as well) the cells of presumptive mesoderm are in t

general character and classification of platyhelminthes

Duck virus hepatitis This highly contagious disease of ducks is caused by a member virus belonging to genus Enterovirus of the family Picornaviridae. It mostly affects duckling

Q. Symptoms of oesophagitis? The symptoms of oesophagitis include heartburn or pyrosis, iron-deficiency anaemia due to chronic tissue bleeding, aspiration, which may cause coug

PHYLUM  CNIDARIA (= COELENTERATA )         Definition and Introduction Tissue  grade eumetazoans with  a radial  symmetry .The  term  coelenterate  signifies the  presence

Explain Precautions for capsule staining in a culture? 1. Never heat fix the smear. This is because by heating shrinkage can occur which may create a clear zone around the cell