Question

An allele is said to be dominant if it is
a) expressed only in heterozygous condition
b) expressed only in homozygous condition
c) expressed in both homo and heterozygous
forms
d) expressed in F, generation
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Answer 1

Explanation:

Alleles are the two individual genes in a particular gene pair that occupy the same locus or position on a homologous pair of chromosomes. An allele may be dominant or recessive. If the allele is expressed in both homozygous and heterozygous conditions, then it is a dominant allele.

option(c) expressed in both homo and heterozygous

expressed in both homo and heterozygousforms. is correct... ☺

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Answer 2

Answer:

(C) EXPRESSED IN BOTH HOMO AND HETEROZYGOUS FORMS.

Explanation:

AN ALLELE IS SAID TO BE DOMINANT IF IT IS ABLE TO EXPRESS ITSELF ,NEGLECTING THE EFFECT OF THE OTHER ALLELE BOTH IN HETEROZYGOUS AND HOMOZYGOUS CONDITION IS SAID TO BE DOMINANT.

AN ALLELE IS SAID TO BE RECESSIVE IF IT CAN ONLY EXPRESS ITSELF IN HOMOZYGOUS CONDITION AND ITS EFFECT GETS SUPPRESED IN HETEROZYGOUS CONDITION.

FOR EXAMPLE, LET A PARTICULAR CHARACTER SAY, FLOWER COLOUR IS REPRESENTED AS: PP FOR DOMINANT VIOLET FLOWERS

                                                       Pp  FOR VIOLET FLOWERS.

                                                      pp FOR WHITE FLOWERS.

HERE P IS SAID TO BE DOMINANT OVER p AND EXPRESS ITS VIOLET COLOUR EVEN IN HETEROZYGOUSCONDITION. AND p I IS CALLED RECESSIVE SINCE IT CAN EXPRESS ONLY IN HOMOZYGOUS CONDITION.

EXCEPTION : (A)BLOOD GROUPING , WHERE BOTH THE ALLELS ARE DOMINANT AND EXPRESS THEMSELF IN HETEROZYGOUS CONDITION.

(B) FLOWER COLOUR OS SNAPDRAGON(FLOWER)

    RR = DOMINANT RED COLOUR.

   Rr = INTERMEDIATE PINK COLOUR.

  rr = RECESSIVE WHITE COLOUR.

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