Answers
1. a) Genotypic and Phenotypic ratio SS –1 (lethal), S+ - 2 (saddle back) and + + -1 (normal) b) S+ -1, + + -1 (saddle back : normal, 1:1 ) c) All ++ (All normal )
2. By crossing a light coloured and normal pigmented common carp the F1 produced will be having light coloured and normal pigmentation in equal proportion.
3. a) leather x mirror Phenotypic ratio – leather : scattered mirror (1:1) Genotypic ratio – ssNn : ssnn (1:1) b) leather x leather Phenotypic ratio – 1 lethal : 2 leather : 1 scattered mirror Genotypic ratio – 1 ssNN : 2 ss Nn : 1 ssnn c) scaled x leather Phenotypic ratio – linear mirror : scaled (1:1) Genotypic ratio – Ss Nn : Ssnn (1:1) d) linear mirror x leather Phenotypic ratio – 2 death : 2 linear mirror : 1 scaled : 2 leather : 1 scattered mirror e) Linear mirror x linear mirror Phenotypic ratio : 4 death : 3 scaled : 6 linear mirror : 2 leather : 1 scattered mirror Genotypic ratio – 1 SSNN : 1 SSNn : 2 SsNN :5 SsNn : 1 SSnn : 2 Ssnn : 1 ssNN : 2 ssNn: 1 ssnn f) scattered mirror x scattered mirror Phenotypic ratio – All scattered mirror Genotypic ratio – All ssnn 4. a) 12 dark : 3 light :1 albino b) 2 dark : 1light :1 albino c) All dark d) All dark e) All dark |