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  • (a) Work out the crosses so as to obtained the phenotypic ratios given below :         (i) 1:2:1 (in  generat

(a) Work out the crosses so as to obtained the phenotypic ratios given below :

        (i) 1:2:1 (in F_{2} generation)

        (ii) 3:1 (in F_{2} generation)

        (iii) 1:1 (in F_{2} generation)

(b) Differentiate between pleitrophy and polygenic inheritance patterns.

 

 

 

 
 
 
 
 

Answers (1)

(a)  i) 1:2:1 (F2 generation)

The inheritance of flower colour in the dog flower (snapdragon or Antirrhinum sp.)

ii) 3:1 (F2 generation) 3:1 is one of the most common phenotypic ratios and can be observed in the case of pea plant.

iii) 1:1 (F1 generation) This can be observed in case of a test cross

b)

PLEIOTROPY

POLYGENIC INHERITANCE

Pleiotropy is controlling of multiple traits by a single gene.

Polygenic inheritance is controlling of a single trait by multiple genes.

Follows the Mendelian inheritance pattern.

A non-mendelian inheritance pattern.

Typically not affected by environmental factors.

Highly affected by environmental factors.

Examples- Albinism, Phenylketonuria

Examples- Skin colour, height, weight

 

Posted by

Priyanka Kumari

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