A blastomere was removed from an 8-cell human embryo, and its beta-globin gene was amplified by PCR. The beta-globin DNA was treated with an enzyme that cuts on either side of and within the normal allele (producing a small fragment), but not within the sickle cell allele (producing a large fragment). Electrophoresis of the treated DNA from the blastomere demonstrated the presence of both a large and small fragment derived from the beta-globin genes. How should you interpret this test?

1764

what are the sub divisions in subkingdom Embryophyta ?

1786

valve guarding superior vena cava in embryonic stage

1828

what is unique about the embryogenesis in paeonia?

1469

What is the advantage, if any, to a germinating seed or seeding in developing a hook? Why is there no heart-shaped stage during embryo development in monocytes? What is the agricultural i mportance of the transgenic rice plant(in 3 paragraphs)

1920

Explain polyembryony and apomixix?

647

After the blastula stage what is the following stage of the embryonic development? How is the passage from blastula to the next stage called?

5

What are the extra embryonic membranes present in vertebrates?

5

Are the extra embryonic membranes the same in all vertebrates?

5

What is the cell division during the first stage of the embryonic development called? How is this stage characterized?

5

What are the archenteron and the blastopore? What is the stage of the embryonic development in which these structures are formed? What are the destinations of the archenteron and of the blastopore?

5

What are extra embryonic membranes?

5

How are animals classified according to the germ layers present in their embryonic development?

5

After the neurula stage and from its ventral portion to the dorsal how can the morphology of the embryo be described?

5

Which is the extra embryonic membrane whose function is to store nitrogen wastes of the embryo? Is this function present in placental mammalian embryos?

5