A point mutation that changes a codon specifying an amino acid into a stop codon is called a- A. missense mutation
B. nonsense mutation
C. frameshift mutation
D. silent mutation

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)

it cools slower in the earth meaning the crystals have more time to form than lava on the surface

during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.

sex cells are usually half's then they find another half and make a fertilize egg