On the planet Kronos, some of the Fraubluchean population displays the Elbus phe

Question

On the planet Kronos, some of the Fraubluchean population displays the Elbus phenotype. Individuals with this phenotype like to place their elbows on tables and won't remove them even when asked. This condition is determined by the genotypes at a single locus, ELB. The alleles at this locus are E (trait allele) and e (the wild-type or non-trait allele).

In a recent study of this population, 125 Fraublucheans known to be homozygous with the EE genotype were phenotyped. Among them, 100 showed Elbus phenotype and 25 did not. Similarly, 250 Fraublucheans who are heterozygous at the ELB locus were phenotyped. None of the 250 individuals showed the trait phenotype (i.e., all were non-elbus). Finally, 100 individuals with the ee genotype (homozygous for the wild-type allele) were phenotyped, and none of them showed the trait phenotype.

An affected male mated with a true-breeding unaffected female. Among their offspring, two of the F1 generation mated in an inter-cross.

If 500 F2 offspring were produced, we'd expect how many to display the Elbus phenotype?

A. 125.

B. 400.

C. 0.

D. 100.

E. 25.

Explanation / Answer

B) 400

Because male is affected and is homozygous whereas female is unaffected and is heterozygous.

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