Ravi's parents have normal colour vision but his maternal grandfather is colour blind. Gene for colour vision is located on the X chromosome.
a) Work out a cross showing the percentage of chances and his siblings being colour blind.
b) What is the genotype of mother
c) state the type of inheritance being shown in the above cross.
Experts I have solved few q/s of genetics on my own so how will u check them can I post at least two to three q/ans to check
Dear student,
Please find below the solution to the asked query
(a) The colourblind grandfather has X'Y (X' represents defective gene); thus, the Ravi's mother is carrier of colour blindness. Ravi's father is normal. A cross between normal father (XY) and carrier mother (X'X) is as follows:
Hence, their is 25% chance that Ravi would be colour blind. 25% chance that his sibling would be carrier (female) and 50% chances of normal siblings.
(b) The genotype of the mother would be X'X.
(c) It shows sex-linked recessive inheritance.
Kindly post separate queries in separate threads.
Please find below the solution to the asked query
(a) The colourblind grandfather has X'Y (X' represents defective gene); thus, the Ravi's mother is carrier of colour blindness. Ravi's father is normal. A cross between normal father (XY) and carrier mother (X'X) is as follows:
|
|
X |
Y |
|
X' |
XX' Carrier female |
X'Y Affected Male |
|
X |
XX Normal female |
XY Normal male |
Hence, their is 25% chance that Ravi would be colour blind. 25% chance that his sibling would be carrier (female) and 50% chances of normal siblings.
(b) The genotype of the mother would be X'X.
(c) It shows sex-linked recessive inheritance.
|
|
X” |
Y |
|
X |
XX” Carrier female |
XY Normal Male |
|
X |
XX” Carrier female |
XY Normal male |
Kindly post separate queries in separate threads.
Hope this information will clear your doubts about the topic.
If you have any more doubts just ask here on the forum and our experts will try to help you out as soon as possible.
Regards If you have any more doubts just ask here on the forum and our experts will try to help you out as soon as possible.