Answer:
(d) Sickle-cell anaemia is an
autosome linked recessive trait. This disease is controlled by a single pair of
allele and only the
homozygous individuals for,
i.e., shows the diseased
phenotype. The heterozygous individuals are carriers ().
Due to point mutation, glutamic acid
(Glu) is replaced by valine (Val) at sixth position of
(3-chain of haemoglobin
molecule. This substitution occurs due to the single base substitution of the
beta globin gene from GAG (Glu) to GUG (Val).Whereas, the other codes GGG, AAG.
GAA do not codes for valine.
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