Describe the similarities and differences between the comb jellies and cnidarians.
What will be an ideal response?
Both of these groups have true tissues, have two germ layers as embryos, and are radially symmetrical as adults. The comb jellies are free-swimming marine invertebrates that have rows of cilia for movement. The body is made up of a jellylike material called mesoglea and they capture prey with sticky threads called colloblasts. The cnidarians can be found in all aquatic environments. Their key features is a stinging cell called a cnidocyte that contains a capsule called a nematocyst. The body of cnidarians is a two-layered sac.
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When phylogenies are created based on the similarities and differences of species’ DNA sequences, this classification system is known as which of the following?
a. cladistics b. phylogenetics c. taxonomy d. molecular systematics
Which connective tissue is best at withstanding compression due the elasticity of its matrix?
a. loose connective tissue b. bone tissue c. cartilage d. fibrous connective tissue e. none of these.
Briefly explain the significance of one of the following fossil primates:Aegyptopithecus, Proconsul,
and the Dryopithecines. What will be an ideal response?
In peas, gray seed color is dominant to white. For the purposes of this question, assume that Mendel crossed plants with gray seeds with each other and the following progeny were produced: 320 gray and 80 white
(a) What is the most probable genotype of each parent? (b) What genotypic and phenotypic ratios are expected in the progeny of such a cross?