In a given geographic location, the combination of all living organisms plus the physical environment in which they live is termed a(n) ________
Fill in the blank(s) with correct word
ecosystem
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How would the phenotypes of progeny differ if a trait was produced from the influence of many genes, compared to a trait caused by a single gene with two alleles and incomplete dominance?
A. They would not differ, and progeny in both would have an array of phenotypes that vary continuously across a range. B. The progeny from the single-gene cross would all be identical, whereas the manygene cross would vary continuously across a spectrum. C. The progeny from the single-gene cross would have three phenotypes, whereas the progeny of the trait caused by many genes would vary continuously across a spectrum.
____ is defined as the percentage of cases in which both members of a pair of twins show the trait when it is known that at least one member shows it
Fill in the blank with the appropriate word.
Although females prefer males with the longest tails, very long tails are typically not found
among males in their natural environment. Why might this be the case?
a. Male birds with very long tails are easily captured and eaten by predators, so they do not survive to reproduce. b. Male birds prefer having shorter tails. c. Mutations have kept tail lengths from increasing. d. There is no advantage to having increased tail length in the natural environment.
Crossing over is one of the most important events in
meiosis because a. it produces new combinations of alleles on chromosomes. b. homologous chromosomes must be separated into different daughter cells. c. the number of chromosomes allotted to each daughter cell must be halved. d. homologous chromatids must be separated into different daughter cells. e. all of these reasons are true.