Donlito8070
19.12.2019 •
Biology
In labrador retriever dogs, coat color is determined by the interaction of two genes (pigment and deposition of pigment). this is called epistasis. coat color can be black (b) or brown (b) and deposition of pigment into the hair shaft is deposited (e) or not deposited (e). if a retriever has the genotype where they have _ _ ee, then they will have a yellow coat regardless of what color they inherit (e.g., bbee or bbee gives a yellow lab).
1. calculate the phenotypic ratios of a cross between a male and a female labrador retrievers that are both heterozygous for coat color and heterozygous for deposition of pigment.
what is the genotype of both the male and female parents?
what are the possible gametes of both the male and female parents?
what is the phenotypic ratio of the offspring?
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Ответ:
Answer 1,2,3,4:
As both are heterozygous therefore Male genotype will be (BbEe) and the genotype of female will be (BbEe). While both will have the phenotype black.
Parent Genotype
Male X Female
BbEe X BbEe
Possible gametes from Parents
Male X Female
BbEe X BbEe
(BE) (Be) (bE) (be) X (BE) (Be) (bE) (be)
...
F1 generation will have following genetypic ratio
Black Labrador = 9 = B_E_
Brown Labrador = 3 = bbE_
Yellow Labrador = 3 = B_ee
Yellow Labrador = 1 = bbee
Furthermore, the phenotypic ration will be
Black Labrador = 9
Brown Labrador = 3
Yellow Labrador = 4
Ответ:
D
Explanation:
because it is transporting toxic waste out and nutrients in and protecting everything inside. Have a great day hope its right and can i have ?