Question
Long Answer Questions
Explain with suitable example an independent assortment.
Explain with suitable example an independent assortment.
✓
Answer
(1) The law of independent assortment states that when hybrid possessing two or more pairs of contrasting characters bearing alleles form gametes, the alleles in each pair segregate independently of the other pair. Therefore, the inheritance of one pair of characters is independent of that of the other pair of characters.
(2) For example, when we cross a pea plant which is tall and having purple flowers with dwarf plant having white flowers we obtain all tall plants with purple flowers in $F_1$ generation. When $F_1$ generation are selfed, $9 : 3 : 3 : 1$ ratio was obtained in $F_2$ generation with $9$ tall and purple flower, $3$ tall with white flowers, $3$ dwarf with purple flowers and 1 which was dwarf and white. Tallness and purple colour are dominant traits while dwarfness and white colour are recessive traits.(i) Homozygous tall purple – TTPP
(ii) Homozygous dwarf white – ttpp
Tall purple $= 9$. Tall white $= 3$
Dwarf purple $= 3$, Dwarf white $= 1$,
Phenotypic ratio $= 9 : 3 : 3 : 1$
Results : The offspring of $F_1$ generation will be in the proportion of $9 : 3 : 3 : 1$, where $9$ are tall purple, $3$ are tall white, $3$ are dwarf purple and $1$ is dwarf white.
(2) For example, when we cross a pea plant which is tall and having purple flowers with dwarf plant having white flowers we obtain all tall plants with purple flowers in $F_1$ generation. When $F_1$ generation are selfed, $9 : 3 : 3 : 1$ ratio was obtained in $F_2$ generation with $9$ tall and purple flower, $3$ tall with white flowers, $3$ dwarf with purple flowers and 1 which was dwarf and white. Tallness and purple colour are dominant traits while dwarfness and white colour are recessive traits.(i) Homozygous tall purple – TTPP
(ii) Homozygous dwarf white – ttpp
Tall purple $= 9$. Tall white $= 3$
Dwarf purple $= 3$, Dwarf white $= 1$,
Phenotypic ratio $= 9 : 3 : 3 : 1$
Results : The offspring of $F_1$ generation will be in the proportion of $9 : 3 : 3 : 1$, where $9$ are tall purple, $3$ are tall white, $3$ are dwarf purple and $1$ is dwarf white.
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