CBSE Class 12-science Answered
In an organism, pink spot is a sex-linked recessive trait and black hair heterozygous female is mated to a white male which is not spotted, the phenotypic ratio of the offspring would be
(1)
1/4 spotted black; 1/4 pink spotted white; 1/4 unspotted black; 1/4 unspotted white
(2)
1/2 pink spotted black; 1/2 pink spotted white
(3)
3/4 pink spotted black; 1/4 pink spotted white
(4)
3/4 unspotted black; 1/4 pink spotted white
Asked by Atulcaald | 19 May, 2018, 01:41: AM
Expert Answer
Pink spot is a sex-linked recessive trait, which means that the trait is expressed only if it is present in homozygous condition.
Let allele B denote black colour and r denote pink spot.
Pink spotted black hair heterozygous female = Bbrr
Not spotted white hair male = bbRr
Parents: Bbrr x bbRr
Gametes: Br, br bR, br
|
|
bR |
br |
|
Br |
BbRr black unspotted |
Bbrr Black pink spotted |
|
br |
bbRr white unspotted |
bbrr white pink spotted |
This implies that the phenotypic ratio of the offspring produced are-
¼ black unspotted : ¼ Black pink spotted : ¼ white unspotted : ¼ white pink spotted.
Answered by Sheetal Kolte | 21 May, 2018, 10:38: AM
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