In humans, free earlobes (E) are dominant to attached earlobes (e) and the presence of freckles...
In humans, free earlobes (E) are dominant to attached earlobes (e) and the presence of freckles (F) is dominant to the absence of freckles (f). If two individual heterozygous for both of these traits were to mate, what is the probability of having a child with attached earlobes and NO freckles?
a. 34.9%
b. 100%
c. 6.25%
d. 16.4%
Homework Answers
option c is correct
solution
Heterozygous individuals
Genotype :EeFf
Phenotype: Free ear lobes with presence of freckles
Parents. EeFf. X. EeFf
Gametes EF Ef eF ef
F1
| EF | Ef | eF | ef | |
| EF | EEFF | EEFf | EeFF | EeFf |
| Ef | EEFf | EEff | EeFf | Eeff |
| eF | EeFF | EeFf | eeFF | eeFf |
| ef | EeFf | EeFf | eeFf | eeff |
Phenotypic ratio
9:3:3:1
9/16 have free lobes and freckles
3/16 have attached lobes and freckles
3/16 have free lobes and no freckles
1/16 has attached lobes and no freckles. (eeff)
probability of attached free lobes and no freckles is
1/16 or 6.25%.
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