You have identified a plant in your garden with a new flower color. You want to determine if this phenotype is dominant or recessive. Which cross would tell you this?
A) crossing the plant to one you know has the recessive trait
B) crossing the plant to a plant of the same type of any color
C) sequencing the DNA for the trait
D) crossing the new plant to one you know has the dominant trait
E) selfing the plant
Answer: A
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Green algae are believed to be the ancestors of the bryophytes. Cite four distinct lines of evidence to support this belief.
What will be an ideal response?
Examine Figure 44.7 in your text, paying attention to the phylogenetic position of sponges in the two phylogenies presented. If the hypothesis represented by the tree on the right is correct, as some molecular evidence suggests, (select all that apply)
A. sponges are monophyletic. B. sponges are paraphyletic. C. the common ancestor of all animals was sponge-like in appearance. D. we don't know what the common ancestor of all animals looked like. E. none of these.
Which factor promotes oxygen release from hemoglobin at the tissue?
a. low blood pressure b. low oxygen gradient c. low temperature d. low carbon dioxide concentration e. low plasma pH
Which one of the following ecosystems is most likely to show an inverted biomass pyramid but a normal energy pyramid?
A. open ocean B. intertidal C. tropical forest D. desert E. grassland