Question

6. In the eastern mosquito fish (which has XX-XY sex determination) spotting is inherited as a Y linked trait. A population of spotted males are mated to non-spotted females which results in 348 offspring. 178 are non-spotted females, 102 are spotted males and 68 are non-spotted males. A) Draw an example pedigree with 5 oflspring and label each individual's genotype. How can this pattern be explained? B) In this same population of 348 mosquito fish, all fish have colored gills, with colors ranging from light green to blue, including all colors in between. How can these coloring patterns be explained?

Answer 1

ANSWER :- Y-linked traut ΐ.e- spotting ís only seen 1m male mosquito,feh enales Gethe ot spotted males Xy* Gunotthe e-tnơm-spotted females :-XX ed inheuitance, only one allede is present om Y (in ove male individual kveom as inheri tamce A áeen im every eeiation lees ot skip ereratier^) uhromesome camy the gene AS st 2 Tlia.ce drith 5叶种Arya adthea rrottes (Examhe) Nor ma ( affected male) ected male Nor Normal Male Normal Aemale Xy I Generation F2 Xx XX XY XY Generation 2 Normal off中nmas No ma/ affected emale males Normal female Y- linked inheitance alnays bass on to the next rom father to Sons onl Th the case above, total 348 oinas are geenout them 118 aru nen spotted femals, 102 males are s and 68 are mon- spetted males

Th lanatfons for the condition are Incomplete penectrance Temberature variathons 4100% penetrance (100% males are, spotted) ns seen iCool temberatures The males ase melanictic + dess トenetrance d's seen m jwar m temperatures expressien ef melanisthi trat mosquhbfishes i maxum +Due t° this reason Aomu, 위shes are melaw stie. (stotted) and seme ase mem- spetic Neu melanistic males occus because they inherit that underao recombinehon cto preduce mermal Y- chvemosome Y-chromosomes x-chrom se mes durina melos i& n wih osomes durim tuAsT Colours The ART to the cheice of mactin? for fishes. The color 茹duces the sexual attivity 、in theft'shu masi m e Co lor