Hiv acts by attaching to receptors on the surfaces of t-cells that aid other lymphocytes in fighting infection. once hiv is inside a cell, its rna is reverse-transcribed and its product dna is integrated into the host cell. it then directs the production of new virus particles. as time goes on the number of t-cells a) increases. b) decreases. c) stays the same. d) is unpredictable.

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.