During embryonic development, the second cavity that forms in the blastocyst becomes filled with amniotic fluid
Indicate whether the statement is true or false
TRUE
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Which of the following intestinal parasites is found in humans and also in pigs?
a. G. lamblia b. D. fragilis c. Cryptosporidium spp. d. Balantidium coli
What is the function of a land plant’s waxy cuticle?
a. Preventing water loss from aerial surfaces b. Secreting toxic compounds to deter animals c. Enabling the root system to extend deeper d. Providing rigidity to stems and leaves
In Drosophila, assume that the gene for scute bristles (s) is located at map position 0.0 and that the gene for ruby eyes (r) is at position 15.0. Both genes are located on the X chromosome and are recessive to their wild-type alleles
A cross is made between scute-bristled females and ruby-eyed males. Phenotypically wild-type F1 females were then mated to homozygous double mutant males, and 1000 offspring were produced. Give the phenotypes and frequencies expected.
It is difficult to estimate current rates of extinction, but we know that extinction rates have risen dramatically in recent years because
A) the fossil record is unreliable. B) current rates of extinction are much higher than that of background rates. C) new species are evolving as fast as species are becoming extinct. D) background extinction rates have increased. E) most species in danger of extinction are microscopic.