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Also in tulips, petal shape is inherited as a Mendelian characteristic. Curled petals are recessive to...

  1. Also in tulips, petal shape is inherited as a Mendelian characteristic. Curled petals are recessive to straight petals. If a true breeding tulip for pink with white stripe and curled petals is crossed with a true breeding tulip for yellow, straight petals what will be the F1 phenotype or appearance? What will the F2 generation look like? Complete two, dihybrid Punnett squares to support your answer.

Solutions

Expert Solution

Pink and curled vs yellow straight tulip

Let us consider the colour of tulip denoted by Y gene and shape of petals denoted by S gene

Pink curled phenotype is result of homozygous recessive genotype I. e yyss

Yellow straight is result of homozygous dominant genotype I. e YYSS

F1 generation will be all yellow straight flowers being YySs

If they self crossed

F2 generation will have gametes YS, Y's, yS and yS

YS Ys yS ys
YS

YYSS

yellow straight

YYSs

Yellow straight

YySS

yellow straight

YySs

yellow straight
Ys

YYSs

yellow straight

YYss

Yellow curled

YySs

yellow straight

Yyss

Yellow curled
yS

YySS

Yellow straight

YySs

Yellow straight

yySS

Pink straight

yySs

Pink straight
ys

YySs

Yellow straight

Yyss

Yellow curled

yySs

Pink straight

yyss

Pink curled

The 9 (yellow straight ):3 (yellow curled ): 3 (pink curled) : 1 (pink curled) would be resulted in F2 generation.

gladiator answered 2 years ago
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