Which of these does not increase the chance that an animal or plant will become fossilized?
a) a slow burial
b) having hard parts
c) living in a dry environment
d) living in a marine environment
e) living in a low-temperature environment

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)

the sugar-phosphate backbone forms the structural framework of nucleic acids, including dna and rna. this backbone is composed of alternating sugar and phosphate groups, and defines directionality of the molecule.