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प्रश्न
If a genetic disease is transferred from a phenotypically normal but carrier female to only some of the male progeny, the disease is ______.
विकल्प
Sex-linked recessive
Autosomal dominant
Sex-linked dominant
Autosomal recessive
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उत्तर
If a genetic disease is transferred from a phenotypically normal but carrier female to only some of the male progeny, the disease is sex-linked recessive.
Explanation:
If a genetic disease is passed from a phenotypically normal but carrier female to only some of the male offspring, it indicates a sex-linked recessive inheritance. In such cases, females can be carriers without showing symptoms because they have two X chromosomes, and the defective gene is recessive. Males, having only one X chromosome, exhibit the disease if they inherit the affected X from the carrier mother, leading to the disease manifesting only in some of the male progeny. This pattern is typical for diseases like haemophilia and color blindness.
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
Why is pedigree analysis done in the study of human genetics? State the conclusions that can be drawn from it.
Very Short Answer Question.
Give an example of a chromosomal disorder caused due to nondisjunction of autosomes.
In human beings 45 chromosomes/single X/XO abnormality causes ______.
A male rabbit of genotype 'AABBDDEE' is crossed with a female rabbit of genotype 'aabbddee' to produce F1 hybrid offspring. How many genetically different gametes can be produced by this F1 hybrid?
Identify the option that correctly represents the number of chromosomes in Down syndrome.
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 |
Why is the frequency of red-green colour blindness is many times higher in males than that in females?
Give definition of non-disjunction.
Which of the following correctly describes the composition of chromosomes in a normal human cell?
