Match the columns :
Column $I$ |
Column $II$ |
$(1)$ Lethal mutation | $(a)$ Mutation caused by external factors |
$(2)$ Spontaneous mutation | $(b)$ They are metabolic errors |
$(3)$ Induced mutation | $(c)$ As a result the mutant dies |
$(4)$ Biochemical mutation | $(d)$ Most of the mutations occurs in nature are of this type. |
$(1-c),( 2-d), (3-a), ( 4-b)$
The phenotypic ratio obtained in quantitative inheritance of a dihybrid cross is
In maize chromosome number is $2n = 20$. The number of linkage groups in it shall be
Select the incorrect statement from the following.
A normal woman whose father was albino marries a man who is albino. What proportion of normal and albino can be expected among their offsprings
Chiasma shows the sites of