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4.Principles of Inheritance and Variation

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The most important example of point mutation is found in a disease called

Thalassemia

Night blindness

Down's syndrome

Sickle-cell anaemia

Solution

Sickle-cell anaemia is caused due to base replacement leading to replacement of sixth amino acid in the -chain. Glutamic acid is replaced by valine and causes sickle cell anaemia.

Std 12

Biology

A normal woman whose father was colour blind, is married to a normal man. The sons would be

medium

(AIIMS-2008)

Gene for colourblindness is located on

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:Match the columns :

Column $I$
Column $II$

$(a)$ Sickle cell anaemia $(x)$ Homogentisic acid

$(b)$ Alkaptonuria $(y)$ Melanin pigmentsare absent

$(c)$ Albinism $(z)$ More amount of phenyl alanine

$(d)$ Phenyl Ketonuria $(w)$ Defective haemoglobin

easy

Give differences : Haemophilia and Sickle-cell Anaemia

medium

Given below is a pedigree chart showing the inheritance of a certain sex- linked trait in humans.

The trait traced in the above pedigree chart is

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Column $I$	Column $II$
$(a)$ Sickle cell anaemia	$(x)$ Homogentisic acid
$(b)$ Alkaptonuria	$(y)$ Melanin pigmentsare absent
$(c)$ Albinism	$(z)$ More amount of phenyl alanine
$(d)$ Phenyl Ketonuria	$(w)$ Defective haemoglobin

The most important example of point mutation is found in a disease called

Solution

Similar Questions

A normal woman whose father was colour blind, is married to a normal man. The sons would be

Gene for colourblindness is located on

:Match the columns : Column $I$ Column $II$ $(a)$ Sickle cell anaemia $(x)$ Homogentisic acid $(b)$ Alkaptonuria $(y)$ Melanin pigmentsare absent $(c)$ Albinism $(z)$ More amount of phenyl alanine $(d)$ Phenyl Ketonuria $(w)$ Defective haemoglobin

Give differences : Haemophilia and Sickle-cell Anaemia

Given below is a pedigree chart showing the inheritance of a certain sex- linked trait in humans. The trait traced in the above pedigree chart is

:Match the columns :

Column $I$
Column $II$

$(a)$ Sickle cell anaemia $(x)$ Homogentisic acid

$(b)$ Alkaptonuria $(y)$ Melanin pigmentsare absent

$(c)$ Albinism $(z)$ More amount of phenyl alanine

$(d)$ Phenyl Ketonuria $(w)$ Defective haemoglobin

Given below is a pedigree chart showing the inheritance of a certain sex- linked trait in humans.

The trait traced in the above pedigree chart is