Question

In: Biology

F1 Wild Type : Red Eyes and Long Wings & Mutants: White Eyes and Short Wings...

F1 Wild Type : Red Eyes and Long Wings & Mutants: White Eyes and Short Wings

Mutant Female x Wild Type Male
Wild Type Wing & Red Eyes Females	121
Mutant Wing & White Eyes Males	95

Wild Type Female x Mutate Male
Wild Type Wing & Red Eyes Females	43
Wild Type Wing & Red Eyes Males	45

F2

Blue Label		Red Label
F1 Female x Mutant Male		F1 Female x Mutant Male
Wild Type Wing & Red Eyes Female	91	Wild Type Wing & Red Eyes Female	42
Wild Type Wing & Red Eyes Males	49	Wild Type Wing & Red Eyes Males	43
Short Wing & Red Eyes Female	0	Short Wing & Red Eyes Female	15
Short Wing & Red Eyes Males	0	Short Wing & Red Eyes Males	14
Wild Type Wing & White Eyes Female	10	Wild Type Wing & White Eyes Female	31
Wild Type Wing & White Eyes Males	5	Wild Type Wing & White Eyes Males	20
Short Wing & White Eyes Female	23	Short Wing & White Eyes Female	42
Short Wing & White Eyes Males	31	Short Wing & White Eyes Males	42
	209		249
F1 Female x F1 Males		F1 Female x F1 Males
Wild Type Wing & Red Eyes Female	202	Wild Type Wing & Red Eyes Female	51
Wild Type Wing & Red Eyes Males	72	Wild Type Wing & Red Eyes Males	50
Short Wing & Red Eyes Female	3	Short Wing & Red Eyes Female	11
Short Wing & Red Eyes Males	13	Short Wing & Red Eyes Males	12
Wild Type Wing & White Eyes Female	16	Wild Type Wing & White Eyes Female	15
Wild Type Wing & White Eyes Males	6	Wild Type Wing & White Eyes Males	27
Short Wing & White Eyes Female	11	Short Wing & White Eyes Female	36
Short Wing & White Eyes Males	62	Short Wing & White Eyes Males	32
	385		234

What is the mode of transmission for each trait, autosomal recessive, autosomal dominant, or sex-linked recessive or sex-linked dominate? What is the recombination frequency?

Expert Solution

In mutant female X wild type male, all the female offsprings are wildtype, while all the male offsprings are mutants for both traits. The F2 generation in the red label in case of back crossing (with mutant male) and F1 crossing are similar. This confirms that F1 males are mutants for both traits.

But in wild type female X mutant male, all the offsprings are wildtype and there is almost equal number of males and females. In the F2 generation, we can observe that there are more females with long wing and there are more males with short wing. Therefore, the trait for length of wings is sex-linked recessive. But there is no such difference between females and males in the case of eye color. Therefore the trait for eye color is autosomal recessive.

SInce both genes are linked (which is evident from the data), let us calculate the recombination frequency.

Recombination frequency is a measure of genetic linkage and is calculated as the percentage of recombinants present in a generation.

In the F2 generation (F1 x F1),

Total number of progeny (both red and blue label) =

Total number of recombinants =

Therefore,

gladiator answered 2 years ago

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