Question

A true-breeding blue shark with angled fin and a true-breeding white shark with a straight fin mate. All F1s are blue with angled fins. Shark color is controlled by the gene R/r, and fin shape is controlled by the gene F/f. What is the genotype of the Parent that is white shark with straight fin?

A. RRff
B. reff
C. Rrff
D. rrFF
E. OR_F_
F. RRFF

Answer 1

The genotype of the white shark with straight fin is rrFF, as this matches the recessive color phenotype and dominant straight fin phenotype displayed by the white shark in the parental generation.

Step-by-step explanation:

The genotype of the white shark with straight fin in the scenario provided would be rrFF. This is because when the F1 generation is all blue with angled fins (which are the dominant phenotypes), it implies that the parental blue shark with angled fins must have contributed the dominant alleles R (for blue color) and F (for angled fins). Since the white shark with straight fins contributes only recessive alleles to have white offspring (a recessive phenotype), its genotype must have the alleles for the recessive color and the dominant fin shape (rr for white color and FF for straight fin).