It was important that Mendel examined not just the F1 generation in his breeding experiments, but the F2 generation as well, because
A) he obtained very few F1 progeny, making statistical analysis difficult.
B) parental traits that were not observed in the F1 reappeared in the F2.
C) analysis of the F1 progeny would have allowed him to discover the law of segregation, but not the law of independent assortment.
D) the dominant phenotypes were visible in the F2 generation, but not in the F1.
E) many of the F1 progeny died.
Ans: B) parental traits that were not observed in the F1 reappeared in the F2.
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The table shows the distribution of traits (A-E) in six extant species (1-6). A "0" indicates the ancestral condition, and a "1" indicates the derived condition. Which pair of species shares the greatest number of derived characters (synapomorphies)?
A. 4 and 5
B. 2 and 4
C. 1 and 4
D. 3 and 4
E. 2 and 5
Clarify Question
· What is the key concept addressed by the question?
· What type of thinking is required?
· What key words does the question contain and what do they mean?
Gather Content
· What do you already know about cladistics?
Consider Possibilities
· What other information is related to the question? Which information is most useful?
Choose Answer
· Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer?
Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
The contacts between the DNA and the histones of the nucleosome are:
A. mainly between the R groups of the histones and the phosphate backbone of the DNA. B. mainly between the conserved histone folds and the bases that are exposed in the major groove of the DNA. C. mainly between the conserved histone folds and the bases that are exposed in the minor groove of the DNA. D. more prevalent in regions of the DNA that have tracts of G?C base pairs. E. primarily between the DNA and the histone peptide backbone.
Genes contain instructions for assembling
a. proteins b. nucleosomes c. operons d. mutagens
Given what you know about normal sex determination in humans, which of the following statements is CORRECT?
a) An "XXY" individual would have a diploid number of 48 since they would have 2 X chromosomes. b) A "YY" male would be sterile. c) "XXXX" individuals would have 3 Barr bodies in their somatic cells. d) "XO" individuals are said to have Klinefelter Syndrome.