Sea otters are important predators of sea urchins, an animal that eats giant brown kelp in continental shelf zones where they fo
rm huge kelp beds. It was observed that the removal of sea otters from the west coast led to an increase in the sea urchin population. These sea urchins fed on the large kelp fronds, destroying the kelp beds that serve as an important source of food and protection for spawning fish. What role does the sea otter play in this case? A.) Dominant Species
B.) Invasive species
C.) keystone species
Keystone species may be defined as the species on which the other species depend directly or indirectly. The removal of keystone specie from the ecosystem can destroy the structure and functioning of the ecosystem.
Sea otters are predators of the sea urchin and regulate its population and forms kelp beds. Removal of sea otters from the ecosystem destroys the population of spawning fish and increase population of sea urchin destroys the kelp beds. Hence, sea otters acts as a keystone species because other species depends on the sea otter.
Explanation: Usually a mother and baby's blood do not mix while the baby is in the womb. The mother's blood runs alongside the placenta, and the nutrients needed by the baby are absorbed and transferred to him/her.
In this case, the biology graduate have to select species-specific genes and then identify if they were expressed in RNA-seq data
Explanation:
By RNA-seq it is possible to identify mRNAs specifically expressed between species since homologous species-specific genes may show single nucleotide polymorphisms (SNPs) among alleles with a biased gene expression
