Which group has radial symmetry?
1.Phylum Cnidaria
2.Phylum Nematoda
3.Phylum Porifera
4.Phylum Platyhelminthes
1
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Place these genes in their temporal order of expression from earliest to latest during Drosophila development.
A. Bicoid, Gap, Homeotic B. Homeotic, Gap, Bicoid C. Homeotic, Bicoid , Gap D. These genes are not expressed at different times during development. They are expressed at the same time, but in a different spatial order. E. Kruppel, gooseberry, even-skipped
Your father is heterozygous for the recessive disorder phenylketonuria (PKU). You know your mother has two "good"
alleles. You have a ____chance of having the disorder.
a. 0% b. 100% c. 25% d. 50% e. 75%
The techniques used to study molecular evolution are based on the comparison of nucleotide and amino acid sequences among species.
a. true b. false
A vascular cambium cell divides to produce an inner and an outer daughter cell. Which outcome represents the probable fate of these cells?
A) Both cells continue to divide to produce wood. B) The inner cell will differentiate into xylem, and the outer cell will divide again. C) The inner cell will differentiate into phloem, and the outer cell will differentiate into xylem. D) Both cells will continue to divide without differentiating into specialized cells.