1. Briefly describe the type of cross, including genotypic and phenotypic information of the parents and...
1. Briefly describe the type of cross, including genotypic and phenotypic information of the parents and offspring, and how it is used in order to determine (25 pts)
a. dominance vs recessive inheritance
b. sex linkage of a locus
c. genetic linkage of loci
PLEASE INCLUDE DETAILED EXPLANATIONS. THANKS
Homework Answers
Types of crosses:
Mono Hybrid cross: In ths only one trait is taken into consideration. E.g: Tall/ short
In this for first generation (F1)
phenotypic ratio is all plants will be tall
genotypic ratio is 1:1
In this for second generation (F2)
phenotypic ratio : 3;1 (3 tall plants, 1 short plant)
genotypic ratio is 1:2:1 (1 TT, 2 Tt, 1 tt)
Dihybrid cross: In this two traits are taken into consideration. eg: Tall/short and colour Black/white
Trihybrid cross: three traits are taken into consideraion Eg: Height of plant , color of seed/flower and shape of seed
phenotypic ratio of F2 generation: 27:9:9:9:3:3:3:1 ratio
genotypic ratio: 1:2:1:2:4:2:1:2:1:2:4:2:4:8:4:2:4:2:1:2:1:2:4:2:1:2:1
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