DNA is comprised of four different types of . Each one is made up of a pentose , a group, and one of four . 2. Adenine, guanine, cytosine and thymine are . 3. Adenine and guanine, which have a nine-member double-ring, are called . 4. Cytosine and thymine, which have a six-member single-ring, are called .

Aparent with freckles is crossed with a parent without freckles. the punnett square shows the possible genotypes and phenotypes of the offspring. which statement accurately describes the probability of phenotypes? a.the offspring are more likely to have freckles. b.the offspring are more likely to have no freckles. c.the likelihood of the offspring having freckles and not having freckles is the same. d.the likelihood of the offspring having freckles and not having freckles cannot be determined.

During binary fission, what events must occur before the cell splits into two new cells?

Across of blue x blue (both heterozygous) would result in