Hugo de Vries formulated the “Mutation Theory'' based on the experiments he conducted on
Althea rosea
Pisum sativum
Drosophila melanogaster
Oenothera lamarckiana
Describe test cross. why it is necessary ?
In a mutational event, when adenine is replaced by guanine, it is the case of
Absence or excess or abnormal arrangement of one or more chromosomes results in
$A$ normal woman, whose father had colour blindness, married a normal man. What is the chance of occurrence of colour blindness in the progeny?
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. |