You are given two populations of true-breeding tomato plants with two traits that sort independently. Using the multiplication rule, how many of the F2 progeny would you expect to have a dominant phenotype for both traits?
A. 9/16
B. 6/16
C. 3/16
D. 1/16
A
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Which term describes species of shark that lay fertilized eggs outside the mother’s body?
a. viviparous b. ovoviviparous c. oviparous d. vivoviparous
In which type of plant tissue does photosynthesis take place?
1.apical meristems 2.xylem 3.parenchyma 4.collenchyma
You find a small, elongated animal embedded in the sand with one end sticking out. Among other things, it has segmental musculature, a coelom, a notochord, and a complete digestive tract with an anus located partway down the body. This animal is
A) an annelid. B) a larval echinoderm. C) either a larval echinoderm or a chordate. D) a chordate.
Which neurotransmitter appears to be associated with an energizing "good" feeling and is essential in hunger, thirst, and sex drive?
A) synapse B) serotonin C) norepinephrine D) dopamine