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Reproduction In Organisms

Question
CBSEENBI12003464
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Assertion : Antirrhinum is a good example to understand incomplete dominance.

Reason : Heterozygotes show characteristics of both the alleles.

  • If both assertion and reason are true and reason is the correct explanation of assertion

  • If both assertion and reason are true but reason is not the correct explanation of assertion

  • If assertion is true but reason is false

  • If both assertion and reason are false.

Solution

C.

If assertion is true but reason is false

Incomplete dominace is a form of intermediate inheritance in which one allele of a specific trait is not completely expressed over its paired allele.

Eg, Inheritance of flower colour in Antirrhinum.

There are two types of flower colour in pure state, red and white. When the two types of plants are crossed, the hybrid or plants of F1 generation have pink flowers. The pink colour apparently appears due to mixing of red and white colours.

Parent generation-    RR (Red)     ×    rr (White)

Gametes-                      R                   r

F1 generation-                        Rr (Pink)

F2 generation-               Rr          ×     Rr

Gametes-                     RR (Red) : Rr (Pink) : Rr (Pink) : rr (White)

Phenotypic ratio- Red : Pink : White

                              1   :    2   :   1

Genotypic ratio- RR : Rr : rr

                            1  :  2  : 1

Some More Questions From Reproduction in Organisms Chapter

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(iii) Bulbourethral gland

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