Label the structural features of the yeast phenylalanine trna.

Answer :

Dark district is the counter codon locale and base sets with the mRNA  

green is the T?C circle (ribouridine and pseudouridine)  

Yellow is the 3' end which has CAA end which connects with the approaching amino corrosive.  

Light blue is the anticodon circle  

red is the DHU circle i.e. dihydrouridine circle  

orange is the additional arm.  

Purple area contains 5' end.

the father in the first generation probably had the recessive colorblind trait in his x chromosome. if he and his wife both had the colorblind trait, even if she had 1 recessive and 1 dominant, then that trait would be passed on to their kids.

(since you didn't attach the family tree this is just an assumption)

"do a testcross with a homozygous recessive plant."