1. Scientists have taken genes from a species of bacteria that is pathogenic to several insects and
inserted the genes into potato plants. The bacterial genes cause a cell to produce toxins that kill
the insects. As the potato plants grow, every cell of the plant contains the toxin-producing genes.
This makes the potato resistant to attack by crop pests.
Which of the following is a limitation of this new technology?

In which case would a scientist choose to use a dissecting microscope rather than a compound microscope

In a classic experiment using pea shape, mendel conducted two separate genetic crosses. in the first cross the parent plants were “true breeding” for pea shape; one had round peas ( r )and the other had wrinkled (r). the first cross produced a filial 1 generation of all round peas. in the second cross, mendel bred plants from the filial 1 generation. this cross produced different results. out of approximately 1000 plants, about 75% were round and 25% were wrinkled.

18. over time, how do sand dunes tend to migrate? a. perpendicular to the movement of the wind b. in the same direction as the wind blows c. toward the wind d. in random directions