71.

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 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

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 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

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

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%

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

According to Darwin, the organic evolution is due to

• intraspecific competition

• interspecific competition

• competition within closely related species

• competition within closely related species

Infection of Ascaris usually occurs by

• drinking water containing egg of Ascaris

• eating imperfectly cooked port

• tse -tse fly

• tse -tse fly