Zoology - Principles of Inheritance and Variation Question with Solution | TestHub
The following pedigree depicts the inheritance of an X-linked recessive trait.
The phenotype of the progeny 1A, 1B and 1C is unknown. What could be the possibility for the progeny?
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Answer:
Solution:
Pedigree analysis provides information regarding inheritance of particular traits or diseases and using it we can predict the possibility of appearance of any traits in the new generation.
Sex-linked recessive disorders are inherent disorders due to mutation in the sex chromosomes, generally the X chromosome. As per the diagram, the female is homozygous for the recessive trait and shows it phenotypically. Since the son (1A) receives X chromosome from mother and Y chromosome from father, the X-linked trait will get expressed in the son. But it will not be expressed in the daughter as she is receiving only one X-from mother and other X chromosome from father resulting in heterozygous condition.
X-linked recessive traits show phenotypically in females only in homozygous condition.
