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  4. Externally observable characters of an individual are called :

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Q. Externally observable characters of an individual are called :

Delhi UMET/DPMTDelhi UMET/DPMT 2001

Solution:

Externally observable characters of an individual are called phenotypes. Phenotype represents feature which are produced by interaction between genotype and environment.
Genotype is the genetic makeup or constitution of an individual, with reference to the traits under consideration.
The organism having two similar genes for a particular character in a homologous pair of chromosomes is known as homozygous.
An individual containing both dominant and recessive genes or traits or characters of a allelic pair is known as heterozygous.