Advertisements
Advertisements
प्रश्न
Why are color-blindness and thalassaemia categorised as Mendelian disorders? Write the symptoms of these diseases seen in people suffering from them.
उत्तर
Thalassaemia and colour blindness are categorised as Mendelian disorders because these are determined by alternation or mutation in a single gene. Symptoms of thalassaemia: The main symptoms of thalassaemia are anaemia, jaundice, hepatosplenomegaly, cardiac enlargement and skeletal deformities Symptoms of colour blindness: The main symptom of colour blindness is the inability of certain human beings to distinguish red and green colour.
APPEARS IN
संबंधित प्रश्न
(a) Why are thalassemia and haemophilia categorized as Mendelian disorders? Write the symptoms of these diseases. Explain their pattern of inheritance in humans.
(b) Write the genotypes of the normal parents producing a haemophilic son.
A colour-blind child is born to a normal couple. Work out a cross to show how it is possible. Mention the sex of this child.
Give an example of a human disorder that is caused due to a single gene mutation.
Name the disorder caused by under secretion of thyroxine in children
The genotype of a person withTumer's syndrome will be:
(i) 44+XXY
(ii) 44+XYY
(iii) 44+XO
(iv) 44+XXYY
Write a note on Down’s syndrome.
Genes for cytoplasmic male sterility in plants are generally located in ______.
In sickle-cell anaemia, shape of RBCs under oxygen tension becomes ______.
Rajesh and Mahesh have defective haemoglobin due to genetic disorders. Rajesh has too few globin molecules while Mahesh has incorrectly functioning globin molecules. Identify the disorder they are suffering from.
| Rajesh | Mahesh | |
| A. | Sickle cell anaemia - an autosome linked recessive trait | Thalassemia - an autosome linked dominant trait |
| B. | Thalassemia - an autosome linked recessive blood disorder | Sickle cell anaemia - an autosome linked recessive trait |
| C. | Sickle cell anemia - an autosome linked recessive trait | Thalassemia - an autosome linked recessive blood disorder |
| D. | Thalassemia - an autosome linked recessive blood disorder | Sickle cell anaemia - an autosome linked dominant trait |
Placed below is a karyotype of a human being.
On the basis of this karyotype, which of the following conclusions can be drawn: ______
