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प्रश्न
Write a note on sex linkage.
उत्तर
- Complete sex linkage:
a. It is exhibited by genes located on non-homologous regions of X and Y chromosomes.
b. They inherit together because crossing over does not occur in nonhomologous regions.
c. Examples of X-linked traits are haemophilia, red-green colour blindness, myopia (near sightedness) and for Y-linked are hypertrichosis, etc. - Incomplete sex linkage:
a. It is exhibited by genes located on homologous regions of X and Y chromosomes.
b. They do not inherit together because crossing over occurs in homologous regions.
c. Examples of X-Y linked traits are total colour blindness, nephritis, retinitis pigmentosa, etc.
संबंधित प्रश्न
Name the ‘two’ types of maps generated by H.G.P.
Answer the following question.
British geneticist R.C. Punnett developed a graphical representation of a genetic cross called “Punnett Square”. Mention the possible result this representation predicts of the genetic cross carried.
From the following disorders identify the ODD one.
All genes located on the same chromosome ______.
What will be the distribution of phenotypic features in the first filial generation after a cross between a homozygous female and a heterozygous male for a single locus?
To determine the genotype of a tall plant of F2 generation, Mendel crossed this plant with a dwarf plant. This cross represents a ______.
Which of the following is a test cross?
Mendal formulated the law of purity of gametes on the basis of ______.
What is true about the crossing over between linked genes?
When ‘Aa’ is crossed with ‘aa’, (A is dominant over a)
