Tom prepared some DNA samples for illumina sequencing. The sample has been confirmed that it has high purity and is free of nuclease contamination. The adapters and indices are also added. The sample can be successfully attached to the chip but the machine cannot identify qualified clusters for further reading. What could be the reason for this problem

Ais a landform that is formed at the mouth of a river from the deposition of sediment carried by the river as the water flows.

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.

Apaleontologist finds a plant fossil that shows that the plant had seeds. what can the paleontologist conclude?