A frog that lacks chemical defenses, yet resembles a poison arrow frog, would exhibit:a
Batesian mimicry.
b. mutualism.
c. camouflage.
d. Müllerian mimicry.
e. epistasis.
a
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Certain species of Bacteria have been identified to cause obesity
Indicate whether the statement is true or false.
Which of the following statements about maternal-effect genes is not correct?
A. Maternal-effect genes are expressed by the mother but affect the phenotype of the offspring. B. The composition of RNA and proteins in an oocyte is not uniform across the cell. C. bicoid and nanos mRNA and protein in Drosophila oocytes are localized either in the anterior (bicoid) or posterior (nanos) of the egg. D. The anterior-posterior axis set up by gradients of Bicoid and Nanos proteins is reinforced by gradients of two transcription regulators called Caudal and Hunchback. E. The caudal and hunchback mRNAs are transcribed in the egg and then transported back to regulate the mother's genome.
The double-pored tapeworm, Diphyllobothrium caninum, consisting of many small proglottids, measures 10 to 70 cm in length as an adult. The scolex contains four suckers and an armed ros-tellum. The intermediate host in which infective cysticercoids develop is the:
a. dog. b. cat. c. flea. d. human.
Which are reasons for the Cambrian Explosion? Check all that apply.
_____ increased oxygen. _____ Hox genes. _____ mammalian dominance. _____ increased ozone. _____ coevolution of predator and prey.