The diagram below represents the pedigree of a certain genetic disease (affected individuals are shaded). What is the mode of inheritance of the gene responsible for this disease?
Important Questions on Principles of Inheritance and Variation
From the following, find out the symbol used in the human pedigree analysis representing males.
The following question has four choices. Choose the best option.
In the given pedigree chart, the trait shown is :
Reason (R): Pedigree is a chart showing record of inheritance of certain traits over two or more ancestral generations of a person.
| Group I | Group II |
| P. Phenylketonuria | i. Melanin synthesis |
| Q. Albinism | ii. Conversion of Phenylalanine to Tyrosine |
| R. Homocystinuria | iii. Tyrosine degradation |
| S. Argininemia | iv. Methionine metabolism |
| v. Urea Synthesis |
(i) Haemophilia is a sex-linked recessive disease.
(ii) Down's syndrome is due to aneuploidy.
(iii) Phenylketonuria is an autosomal recessive gene disorder.
(iv) Sickle cell anaemia is an X-linked recessive gene disorder.
A woman heterozygous for colour blindness marries a colour-blind man. What would be the ratios of carrier daughters, colour-blind daughters, normal sons, and colour-blind sons in the F1 generation?
The following two pedigrees describe the autosomal genetic disorders and in Family and Family , respectively.
Choose the CORRECT statement from the following options.
