Which of the following type of inheritance is shown by colour blindnes...
Criss-cross inheritance is the type of inheritance shown by color blindness.
Explanation:
Color blindness is a genetic disorder that affects an individual's ability to perceive certain colors. It is more common in males than in females because the genes responsible for color vision are located on the X chromosome. Since males have only one X chromosome (XY) while females have two (XX), the inheritance pattern of color blindness follows a criss-cross pattern.
Here is a detailed explanation of why criss-cross inheritance is the correct answer:
1. Chromosomal inheritance:
- Chromosomal inheritance refers to the transmission of genes from one generation to the next through chromosomes.
- In the case of color blindness, the genes responsible for color vision are located on the X chromosome.
- The inheritance of color blindness is influenced by the sex chromosomes and follows a distinct pattern.
2. Zig-zag inheritance:
- Zig-zag inheritance is not a recognized term in genetics and does not describe the inheritance pattern of color blindness.
3. Up-down inheritance:
- Up-down inheritance is not a recognized term in genetics and does not describe the inheritance pattern of color blindness.
4. Criss-cross inheritance:
- Criss-cross inheritance describes the pattern of inheritance for X-linked traits, such as color blindness.
- In this pattern, the gene for color blindness is passed from a carrier mother (who has one normal X chromosome and one X chromosome carrying the color blindness gene) to her sons.
- Sons who inherit the color blindness gene from their carrier mother will be color blind, while daughters who inherit the gene will become carriers.
- Since the father contributes the Y chromosome to his sons, they cannot inherit the color blindness gene from him.
Therefore, the correct answer is option 'B' - Criss-cross inheritance.
Which of the following type of inheritance is shown by colour blindnes...
Colour-blindness is a sex-linked trait which shows criss-cross inheritance which means male transmits his trait to his grandson through his daughter, while a female transmits the traits to her granddaughter through her son.