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Principles Of Inheritance And Variation

Question
CBSEENBI12047507
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A women with albinic father marries an albinic man. The proportion of her progeny is

  • 2 normal : 1 albinic

  • All normal

  • All albinic

  • 1 normal : 1 albinic

Solution

D.

1 normal : 1 albinic

Albinism is an autosomal recessive metabolic disorder. It is characterised by the complete or partial absence of pigment in the skin, hair and eyes due to the absence or defect of tyrosinase, a copper-containing enzyme involved in the production of melanin.

An albino man (rr) marries a normal women (RR). Their progeny carries one recessive allele (r) and one dominant allele (R), i.e. it is heterozygous. When this heterozygous daugther (Rr) marries albinic man (rr), the proportion of her progeny found out to be 1 albino and 1 normal.

Some More Questions From Principles of Inheritance and Variation Chapter

Write down Mendel’s dihybrid Phenotypic ratio 

Who were the rediscoverers of Mendelism ?

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

What is the unique feature of F1 generation ?

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 ?

What term is used for the two chromatids resulting from the interchange of segments during crossing over ?

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