According to Darwin, the organic evolution is due to
intraspecific competition
interspecific competition
competition within closely related species
competition within closely related species
B.
interspecific competition
Darwin stated that the organic evolution is due to interspecific competition. it is the competition between members of different species. Intraspecific competition occurs amongst members of the same species for obtaining optimum amounts of their food, shelter, mate, water, light, species etc. Closely species compete cannot cause evolution. Reduced feeding efficiency in one species due to the presence of interfering species is due to strugle for existance.
If both parents are carriers for thalassemia, which is an autosomal recessive disorder, what are the chances of pregnancy resulting in an affected child?
No Chance
50%
25%
25%
Infection of Ascaris usually occurs by
drinking water containing egg of Ascaris
eating imperfectly cooked port
tse -tse fly
tse -tse fly
Which of the following cannot be detected in a developing foetus by amniocentesis?
Klinefelter's syndrome
sex of the foetus
Down's syndrome
Down's syndrome
The incorrect statement with regard to haemophilia is
It is a sex - linked disease
It is a recessive disease
It is dominant disease
It is dominant disease
Which enzyme/s will be produced in cell in which there is a non-sense mutation in the lac Y gene?
beta - galactosidase
Lactose permease
Transacetylase
Artificial insemination means
transfer of sperms of a healthy donor to test-tube containing ova
transfer of sperms of a husband to test-tube containing ova
artificial introduction of sperms of the healthy donor into the vagina
artificial introduction of sperms of the healthy donor into the vagina
Which one of the following is not the function of the placenta? It
facilitates the supply of oxygen and nutrients to the embryo
secretes oestrogen
facilitates removal of carbon dioxide and waste material from embryo
facilitates removal of carbon dioxide and waste material from embryo
One of the legal methods of birth control is
abortion by taking an appropriate medicine
by abstaining from coitus from day 10-17 of the menstrual cycle.
by having coitus at the time of daybreak
by having coitus at the time of daybreak
Which is Mendelian idea depicted by a cross in which the F1 generation resembles both the parents?
Incomplete dominance
Law of dominance
Inheritance of one gene
Inheritance of one gene
