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प्रश्न
Give an example of an autosomal recessive trait in humans. Explain its pattern of inheritance with the help of a cross.
उत्तर
Sickle cell anaemia is an example of autosomal recessive trait in humans. The genes responsible for this disease are located on autosomes. This disease is only expressed if both the copies are defective. People with a single defective copy of the gene are clinically normal; however, they can pass on this defective gene to their subsequent generations.
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संबंधित प्रश्न
If only one 'X' chromosome is found in a female person, which of the following symptoms she will show?
- epicanthal skin fold
- webbing of neck
- small testis and absence of spermatogenesis
- presence of simian crease on the palm
State any two symptoms of Down’s syndrome.
Give a detail account of thalassemia.
Feminised males have ______ chromosomes.
Following list indicates various genetic diseases. Identify the diseases that are not caused due to single gene defect.
Huntington's chorea, alkaptonuria, Sickle cell anaemia, Down syndrome, thalassemia, Taysachs disease, Turner syndrome, cystic fibrosis, haemophi Lia, Klinefelter syndrome, albinism
Genes for cytoplasmic male sterility in plants are generally located in ______.
Extra chromosome ‘X’ is present in which one of the following cases?
The most striking example of point mutation is found in a disease called ______.
Trisomy is represented by ______.
Jacob is genetically a carrier of the disorder that affects the shape of the RBCs, as shown in the diagram below. His son James suffers from the same disorder.
- Give the biochemical reason for the disorder that changes the shape of the RBCs, as shown above.
- Draw a Punnett square to show the genotype of the mother of James.
- Name and define the type of 'point mutation' responsible for this disorder.
