You are following four traits
January 18th, 2023
You are following four traits (a, b, c, and d).The following crosses were performed.
– Cross 1: a b female x c d male
F1 progeny: all wild type
– Cross 2: F1 female x F1 male
F2 progeny: 1600 wild type
(total 6400) 800 d
400 b d
800 a
400 a b
1200 c
400 dc
800 b
A. Describe the inheritance pattern for each trait. Be as complete as possible.
B. Which, if any, genes are linked? Can you provide a mapdistance between the genes?
Answer:
Recombination frequency (R.F.) between the genes c-d is minimummeans they are linked, as they are closely located on a chromosome.If the value of Recombination frequency (R.F.) comes less than 17%it means genes are linked.
- R.F. between a-b is 37.5% this value is greater than 17%, meansthese genes are located on two separate chromosomes means thesegenes are located on two separate chromosomes means they will besegregated independently during gamete formation.
- Mode if inheritance of the gene b, c will be similar to thegenes a-b, as described above because recombination frequency ofthem is greater than 17%.
- Genes c-d are linked because their recombination frequency isminimum, thus they will not be segregated independently as they areclosely located.
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