Question

In: Biology

Parent phenotype: female: apterous and red eyes male: male winged and sepia eyes (note: sepia begins...

Parent phenotype:

female: apterous and red eyes
male: male winged and sepia eyes (note: sepia begins as orange and transitions to gray/black as flies mature)

a) Considering both parents are homozygous for each trait, what are the parents' genotypes?

b) Using a Punnett square for a dihybrid cross, calculate the genotype and phenotype for the F1 flies.

c) With the information obtained from the F1 genotypr, use a Punnett square to calculate the expected genotype and phenotype ratios for the F2 generation.

d) What is the expected phenotype ratio for the F2 generation?

Solutions

Expert Solution

Apterous is wingless . Wingless flies is a recessive trait and winged is the dominant trait .

Red eyes is similarly the dominant trait and sepia eyes is the recessive trait.

The dominant traits are exptessed in homozygous dominant and heterozygous conditions. That is WWRR or WwRr

In F1 generation all the genotypes are WwRr so genotypic ratio is 1.

All phenotype will be winged and ted colored eyes ,so again phenotypic ratio is 1.

If this helps please give it a positive rating thank you!


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