I believe that B and D are the only answers that I am sure of. C is incorrect and A seems incorrect as well. E may be a correct answer, but you will need to check the chemical equation. Hope this helps!
Gametes of the parents would be:
PpTt : PT ; Pt ; pT ; pt
Pptt : Pt ; Pt; pt ; pt
You can do this easily using the FOIL method on each genotype. Just like in math, F stands for first; O stands for outside; I stands for inside; and L stands for last. I'll do one parent genotype and maybe you will understand how this was done:
GENOTYPE: <em>PpTt</em>
<em>F- </em><em>irst of each pair. P and T</em>
P p T t
Gamete: <em>PT</em>
<em>O </em><em>- utside allele of the pair. P and t</em>
P p T t
Gamete: Pt
<em>I - </em><em>inside alleles of the pair. p and T</em>
P p T t
Gamete: pT
<em>L</em><em>-ast or end allele of each pair. p and t</em>
P p T t
Gamete: pt
Photons from light and electrons traveling through the photosystems