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4.Principles of Inheritance and Variation
medium
What is the correct sequence of the following events
$1.$Formation of the chromosome theory of heredity
$2.$Experiments which proved that $DNA$ is the hereditary material
$3.$Mendel's laws of inheritance-discovery
Code :
A
$1, 3$ and $2$
B
$1, 2$ and $3$
C
$3, 1$ and $2$
D
$2, 1$ and $3$
Solution
It's Obvious
Standard 12
Biology
Similar Questions
Match the terms in column $I$ with their description in column $II$ and choose the correct option.
Column $-I$ | Column $-II$ |
$(A)$ Dominance | $(i)$ Many genesgovern a single character |
$(B)$ Codominance | $(ii)$ In a heterozygousorganism only one allele expresses itself |
$(C)$ Pleiotropy | $(iii)$ In a heterozygousorganism both alleles express themselves fully |
$(D)$ Polygenic | $(iv)$ A single gene inheritanceinfluences many characters |
Match the Column – $I$ with $II$
Column – $I$ | Column – $II$ |
$(a)$ Pleiotropic gene | $(i)$ Both allele express equally |
$(b)$ Co-dominance | $(ii)$ Change in nucleotide |
$(c)$ Epistasis | $(iii)$ One gene shows multiple phenotypic expression |
$(d)$ Mutation | $(iv)$ Rust disease |