Which of the following is NOT considered an extraembryonic membrane?

a. the yolk sac
b. the amnion
c. the chorion
d. the allantois
e. the placenta


E

Biology & Microbiology

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Genetic drift is the _____ in allele frequencies from generation to generation and is especially important in _____ populations

A. random change; small B. random change; large C. change due to selection; small D. change due to selection; large E. none of these

Biology & Microbiology

A keystone species has a greater effect on community structure than its numbers might suggest

Indicate whether the statement is true or false.

Biology & Microbiology

Where is the electron transport chain located in bacterial cells?

A. Mitochondrial inner membrane B. Plasma membrane C. Mitochondrial outer membrane D. Periplasm

Biology & Microbiology

In Drosophila, the allele red eyes (bw+) is dominant to the allele for brown eyes (bw). At another gene locus on the same chromosome, the allele for thin wing veins (hv+) is dominant to the allele for heavy wing veins (hv). Flies homozygous for bw and hv+ are crossed to flies homozygous for bw+ and hv to obtain doubly heterozygous F1 progeny.Given that these two gene loci are very closely linked, the phenotypic ratio in the F2 generation should be closest to

A. 3 red eye, thin wing veins: 1 brown eye, heavy wing veins B. 1 brown eye: 1 red eye: 1 heavy wing veins: 1 thin wing veins C. 1 brown eye, heavy wing veins: 2 red eye, thin wing veins: 1 brown eye, thin wing veins D. 1 brown eye, thin wing veins: 2 red eye, thin wing veins: 1 red eye, heavy wing veins

Biology & Microbiology