Dominant alleles are expressed in

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(D) Dominant alleles are expressed in both homozygous and heterozygous conditions.According to the Principle of Dominance:In heterozygous individuals

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Both $(b)$ and $(c)$

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(D) Dominant alleles are expressed in both homozygous and heterozygous conditions.According to the Principle of Dominance:In heterozygous individuals or hybrids,a character is represented by two contrasting factors called alleles or allelomorphs. Out of the two contrasting alleles,only one is able to express its effect in the individual. It is called the dominant factor or dominant allele.The other allele,which does not show its effect in the heterozygous individual,is called the recessive factor or recessive allele. The cross between a pure tall and a pure dwarf plant gives all progeny $(F_{1})$ as tall.The character shown by the $F_{1}$ generation is called the dominant character.

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Pure tall plants are crossed with pure dwarf plants. In the $F_1$ generation,all plants were tall. These tall plants of the $F_1$ generation were selfed,and the ratio of tall to dwarf plants obtained was $3:1$. This is called:

Mendel's results on the inheritance of characters were rediscovered by

To determine whether $F_1$ hybrid is homozygous or heterozygous for a particular trait,a . . . . . . cross is performed.

$A$ recessive gene is one which

Mendel crossed tall and dwarf plants. In the $F_{2}$-generation,the observed ratio was $3: 1$ (tall: short). From this result,he deduced:
$I.$ Law of dominance
$II.$ Law of independent assortment
$III.$ Law of segregation
$IV.$ Incomplete dominance
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