normal bristles, kidney eye missing bristles, normal eyes missing bris mb mb, k

Question

normal bristles, kidney eye missing bristles, normal eyes missing bris mb mb, k tles, kidney eyes 193 stems was allowed to self-fertilize. From the resultino seeds, 650 adult plants were obtained. The phenotypes of these offspring are listed here. 24. A snaupsdragon with pink petals, black anthers, and long 78 red longtan 26 red short tan 44 red long black 15 red short black 39 pink long tan 13 pink shorttan 204 pink long black 68 pink shortblack nt 5 white long tan 2 white short tan 117 white long black 39 white short black a. Using P for one allele and p for the other, indicate how flower color is inherited. e orig- b. What numbers of red : pink : white would have been expected among these 650 plants? ps ofc. How are anther color and stem length inherited? e? If and the d. What was the genotype of the original plant? e. Do any of the three genes show independent assortment? f. For any genes that are linked, indicate the arran gene of ecessive eyes. ments of the alleles on the homologous chron somes in the original snapdragon, and estim distance between the genes

Explanation / Answer

a. Total number of pink flowers-39+13+204+68=324

Total number of red flowers-78+26+44+15=163

Total number of white flowers-5+2+117+39= 163

Now when the two pink coloured flowers were crossed two new coloured flowers-red and white were obtained. The ratio of flowers obtained is -163:324:163 or 1:2:1 ratio.This is showing incomplete dominance.

Thus red flowers are PP, white flowers are pp and pink flowers are Pp.

Pp X Pp

1 red: 2 pink: 1 white flower

b.If it followed complete dominance as suggested by Mendel then in F1 all the flowers would have been red and if they were selfed then in F2, 3 flowers should be red and 1 white. There would be no pink flowers. Then out of 650 flowers, 488 should be red and 163 white.

c.anther colour-

tan-78+26+39+13+5+2 = 163

black 44 +15+204+68+117+39=487

Black :tan = 487 : 163 =3:1

This is in accordance with Mendel`s law of dominance i.e F2 being in the ratio 3:1.

stem length-

long-78+44+39+204+5+117= 487

short- 26+15+13+68+2+39 = 163.

Long: short = 487:63

This is in accordance with Mendel`s law of dominance i.e F2 being in the ratio 3:1.

d.The genotype of original plants would have been

PP BB LL X pp bb ll

red petals black anthers and long stems x white petals tan anthers short stems - parental generation

Pp Bb Ll F1

Pink Petals, black anthers and long stem

P p P PP Pp p Pp pp

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