"O código genético tem a característica de ser degenerado, e isso significa que (i) distintos podem corresponder a um único (ii)". As palavras que completam corretamente (i) e (ii) na afirmação são: A.
(i) códons e (ii) nucleotídeo.

B.
(i) códons e (ii) aminoácido.

C.
(i) nucleotídeos e (ii) aminoácido.

D.
(i) nucleotídeos e (ii) códon.

E.
(i) aminoácidos e (ii) códon.

when charles darwin published  the origin of species  150  years ago he consciously avoided discussing the origin of life. however, analysis of some other texts written by darwin, and of the correspondence he exchanged with friends and colleagues demonstrates that he took for granted the possibility of a natural emergence of the first life forms. as shown by notes from the pages he excised from his private notebooks, as early as 1837 darwin was convinced that “the intimate relation of life with laws of chemical combination, & the universality of latter render spontaneous generation not improbable”. like many of his contemporaries, darwin rejected the idea that putrefaction of preexisting organic compounds could lead to the appearance of organisms. although he favored the possibility that life could appear by natural processes from simple inorganic compounds, his reluctance to discuss the issue resulted from his recognition that at the time it was possible to undertake the experimental study of the emergence of life.

refer to the attachment !

answer 1 : therefore:   crossing results in 50% (dominant homozygote) and 50% (dominant heterozygote).

answer 2 : therefore:   crossing results in 25% (dominant homozygote), 50% (dominant heterozygote) and 25% (homozygous recessive).

answer 3 : therefore:   crossing results in 100% (homozygous recessive).