(a) What are multiple alleles? Give an example.
(b) Write the symptoms of Klinefelter's syndrome.

Explanation

(a) When a gene expresses itself in more than 2 alletic forms the alleles are called multiple alleles.
eg: The gene .I. controls the humans blood group . It exist in 3 different alleleic forms i.e., I,I`^(B)`, and I, and is responsible for the four human blood groups viz, A, B, O and AB.(b) Symptoms:
*Small penis
* Diminished pubic , axillary , and facial hair
* Enlarged breast tissue (called gynecomastia)
* learning disabities
* Simian crease (a single crease in the palm)
* A bnormal body proportions (long legs , short trunk)
* Small firm testicles
* sexual dysfunction
* Tall stature
* Personality impairment