Yellowstone Lake, occupied by S. yellowstonensis, sits in a volcanic caldera, and is heavily influenced by superheated water carrying extraordinarily high levels of dissolved nutrients that diatoms need to grow, levels much higher than typical in other lakes occupied by S. niagarae. The soils of its basin though are composed mostly of obsidian sand (glass!!) which will cause very low levels of other nutrients. Altogether it is a very different lake than those typically having S. niagarae. Why is this important?

a. Such differences might create a different selective environment than those of most lakes occupied by S. niagarae, so that any S. niagarae dispersing into the lake could only survive by adapting and changing its traits.
b. Drift occurs quickly in stressed populations.
c. Both answers are correct.

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Nhumans, abo blood types refer to glycoproteins in the membranes of red blood cells. there are three alleles for this autosomal gene: ia, ib, and i. the ia allele codes for the a glycoprotein, the ib allele codes for the b glycoprotein, and the i allele doesn't code for any membrane glycoprotein. ia and ib are codominant, and i is recessive to both ia and ib. people with type a blood have the genotypes iaia or iai, people with type b blood are ibib or ibi, people with type ab blood are iaib, and people with type o blood are ii. if a woman with type ab blood marries a man with type o blood, which of the following blood types could their children possibly have? in humans, abo blood types refer to glycoproteins in the membranes of red blood cells. there are three alleles for this autosomal gene: ia, ib, and i. the ia allele codes for the a glycoprotein, the ib allele codes for the b glycoprotein, and the i allele doesn't code for any membrane glycoprotein. ia and ib are codominant, and i is recessive to both ia and ib. people with type a blood have the genotypes iaia or iai, people with type b blood are ibib or ibi, people with type ab blood are iaib, and people with type o blood are ii. if a woman with type ab blood marries a man with type o blood, which of the following blood types could their children possibly have? a, b, ab, and o ab and o a, b, and o a and b