Activity 9.1 NCERT Class 10 Science, Heredity and Evolution

Activity 9.1 NCERT Class 10 Science, Heredity and Evolution

Detached ear lobe.
Brief Procedure: 

Activity 9.1 asks us to observe the ear lobes of friends and compare them with their parents.

Observation:

Detached lobe is more frequent in friends with parents with the detached lobe.

Explanation:

If we observe ear lobes of people around us, we find that some have detached ear lobe while others have attached ear lobes.

Ear lobe shape is a genetic feature and follows simple Mendelian rule. Here detached lobe is dominant while attached lobe is recessive. So in the environment, we find detached lobe more frequent. For example, In real life instance, it is around 67% and 33% respectively.

inheritance of ear lobe
inheritance of ear lobe

See also: Experiment to confirm genotype ratio 1:2:1. Activity 9.2.

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