Sickle cell anemia is caused by a single point mutation, in one of the exons that codes for the synthesis of β-globin. The picture below shows the DdeI restriction sites in the normal and sickle cell alleles of the β-globin gene. Notice that the mutation that causes sickle cell eliminates the second DdeI site. On the gel provide below draw what the restriction fragments would look like for an individual that is homozygous for the normal allele (AA), for an individual that is a heterozygous carrier (AS), and for an individual with sickle cell disease (SS). How many bands would appear on the gel of the heterozygote?

Why was mendel's work not accepted at the time? o a. his results were false. o b. he did not repeat his experiments. o c. he did not have any data. o d. his results were surprising,

In the respiration-photosynthesis cycle shown above, what are the products of cellular respiration that belong in box 2?

(me out over the last several centuries, scientists have made the following broad observations while investigating several branches of the life sciences: -the fossil record shows that different types of organisms have existed at different times in earth's history. -many organisms have similar body structures that seem to be adapted to different ways of living in their environment. -organisms of different species often share similarities in stages of embryonic development. -many species share genetic similarities, and almost all organisms use the same basic building blocks to construct proteins. -often, the extent of two species' similarities can be predicted from their geographic closeness to each other. -a great deal of change has been observed among species that have experienced strong selective pressures through many generations. scientists have carefully considered and rigorously tested the observations listed above. when scientists offer a of these observations, they are making 1.) testable explanation, deductive explanation 2.) scientific interference, scientific law