What is the evidence that differentiation produces specialized cells without the loss of genes?
What will be an ideal response?
ANSWER: Research has indicated that selective gene loss does not occur in differentiated cells. First,
if a nucleus from a fully differentiated frog cell is inserted into a fertilized egg where the
nucleus has been destroyed, the egg will develop into a normal tadpole and adult frog.
Second, the sheep, Dolly, was successfully cloned from an adult cell nucleus, which is only
possible if the adult cells retain all of their genes.
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Which of the following are arranged in the sequence in which the various taxa first appeared in time?
A. bacteria, protists, charophyceans, liverworts, lycophytes, gnetophytes, angiosperms B. Archaea, protists, charophyceans, mosses, ferns, conifers, flowering plants C. bacteria, protists, charophyceans, mosses, cycads, angiosperms D. prokaryotes, protists, charophyceans, mosses, ferns, conifers, flowering plants E. All the other choices provided are correct
Which of the following terms are mismatched?
a. heartwood...non-conduction b. sapwood...outer wood c. early wood...small xylem cells d. tropical trees...no rings e. none of these terms are mismatched
In terms of the size of offspring, data from different (a) fish families and (b) fruit fly species are represented in the accompanying figure. Evaluation of this data reveals that ________
A) no relationship between these two variables has been found B) the larger the number of offspring, the larger the eggs that are produced C) the larger the number of offspring, the smaller the eggs that are produced D) there is an apparent trade-off between egg size and number of offspring E) Both C and D are accurate statements.
What is a method of determining the genotype of an individual with a dominant phenotype?
A. Monohybrid cross B. Testcross C. Law of segregation D. Genetic analysis E. Genetic fingerprinting