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Principles Of Inheritance And Variation

Question

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During a medical investigation, an infant was found to possess an extra chromosome 21. Decribe the symptoms the child is likely to develop later in the life.

Solution

An additional copy of chromosome number 21 (trisomy of chromosome number 21) in humans results in Down’s syndrome.Following characteristic symptoms are likely to develop in the child due to the above mentioned conditions:
(i) Short statured with small, round head.
(ii) Furrowed tongue and partially open mouth.
(iii) Broad palm with characteristics palm crease.
(iv) Slow mental, physical and psychomotor development.

Some More Questions From Principles of Inheritance and Variation Chapter

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Write down Mendel’s dihybrid Phenotypic ratio

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What are the real determinants of what an organism will become ?

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What will be the genetic make up of an organism which suffers from sickle cell anaemia ?

What do the symbols square and circle in a pedigree chart indicate ?

Define heterogamy. Give an example.

How many chromosomes are found in human cells ?

Why is male Drosophila regarded as heterogametic ?

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