1° Step
write the question data
Black fur (W), Fawn fur (w)
Long ears (E), short ears (e)
2º Step
Make the cross between the heterozygous parents
WwEe x WwEe (Punnett square)
3° Step
The phenotypic proportion is equal to:
9:3:3:1
Being: 9 with W_E_ (genotype), being black fur and long ears pugs;
3 with W_ee and wwE_, being black fur and short ears and fawn fur and long ears;
1 with wwee, being pugs with fawn fur and short ears.
Therefore, the proportion of offspring with fawn fur and long ears (wwE_) is
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, equals to 18,75 % of the offspring.