Match the terms in Column I with their description in Column II and choose the correct option. 

	Column I		Column II
A.	Dominance	1.	Many govern a single character
B.	Codominance	2.	In a heterozygous organism, only one allele expresses itself
C.	Pleiotropy	3.	In a heterozygous organism, both alleles express themselves fully
D.	Polygenic inheritance	4.	A single gene influences many characters

 

	A	B	C	D
1.	2	3	4	1
2.	4	1	2	3
3.	4	3	1	2
4.	2	1	4	3

Sickle cell anaemia has not been eliminated from the African population because:

1. It is controlled by recessive genes

2. It is not a fatal disease

3. It provides immunity against malaria

4. It is controlled by dominant genes

Select the incorrect statement:

What map unit (Centimorgan) is adopted in the construction of genetic maps?

A woman has an X-linked condition on one of her X chromosomes. This chromosome can be inherited by:

All genes located on the same chromosome:

Conditions of a karyotype 2n +1, 2n –1 and 2n + 2, 2n – 2 are called:

If a genetic disease is transferred from a phenotypically normal but carrier female to only some of the male progeny, the disease is:

In a certain taxon of insects, some have 17 chromosomes and others have 18 chromosomes. The 17 and 18 chromosome-bearing organisms are:

1. males and females, respectively

2. females and males, respectively

3. all males

4. all females

The inheritance pattern of a gene over generations among humans is studied by pedigree analysis. The character studied in the pedigree analysis is equivalent to: