BIOLOGY 12TH ED (LL) W/ CONNECT
12th Edition
ISBN: 9781264898091
Author: Raven
Publisher: MCG
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Chapter 21, Problem 3S
Summary Introduction
To draw:
The relationship between the beak depth of parents and offsprings in the Fig, 21.2 b “Evidence that natural selection alters beak shape in the medium ground finch, Geospiza fortis”, given that they have no genetic bases.
Introduction:
The
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In an assessment of learning in Drosophila, flies were trained to avoid certain olfactory cues. In one population, a mean of 8.5 trials was required. A subgroup of this parental population that was trained most quickly (mean = 6.0) was interbred, and their progeny were examined. These flies demonstrated a mean training value of 7.5. Calculate realized heritability for olfactory learning in Drosophila.
Fruit weight is controlled by 4 gene pairs. The homozygous dominant weighs 200 g while the homozygous recessive weighs 80 g. Assume that the alleles have equal contribution and have cumulative effects. The F1 and F2 of the two parents below were studied
Parent 1 Parent 2
B1B1B2B2B3B3b4b4 x b1b1b2b2b3b3B4B4
a.) Compute for the contribution of the dominant allele.
b.) Compute for the fruit weight of parental 1 and parental 2.
c.) Provide the genotype and phenotype of the F1.
d.) Compute for the frequencies of the different individuals in the F2.
A naturalist visiting an island in the middle of a large lake observes a species of small bird with three distinct types of beaks.
Those with short, crushing beaks (BB) consume hard-shelled nuts, those with long, delicate beaks (bb) pick the seeds from pinecones, and those with intermediate beaks (Bb), consume both types of seeds though they are not as good at either.
Assume that this difference in beak morphology is the result of incomplete dominance in a single locus gene.
Which of the mated pairs below will have the best adapted offspring in a year in which most of the food available is in the form of hard-shelled nuts? Show all work.
Long delicate beak (bb) x short crushing beak (BB)
Intermediate beak (Bb) x intermediate beak (Bb)
Chapter 21 Solutions
BIOLOGY 12TH ED (LL) W/ CONNECT
Ch. 21.1 - Prob. 1LOCh. 21.1 - Prob. 2LOCh. 21.2 - Prob. 1LOCh. 21.2 - Distinguish between demonstrating that evolution...Ch. 21.3 - Contrast the processes of artificial and natural...Ch. 21.3 - Prob. 2LOCh. 21.4 - Prob. 1LOCh. 21.4 - Prob. 2LOCh. 21.4 - Prob. 3LOCh. 21.5 - Explain the evolutionary significance of...
Ch. 21.5 - Prob. 2LOCh. 21.6 - Prob. 1LOCh. 21.6 - Prob. 2LOCh. 21.7 - Characterize the criticisms of evolutionary theory...Ch. 21.7 - Prob. 2LOCh. 21 - Suppose that a male with a beak depth of 10 mm...Ch. 21 - Prob. 1IQCh. 21 - Prob. 2IQCh. 21 - Prob. 3IQCh. 21 - Why might the evolutionary line leading to...Ch. 21 - Artificial selection is different from natural...Ch. 21 - Gaps in the fossil record a. demonstrate our...Ch. 21 - The evolution of modern horses (Equus) is best...Ch. 21 - Homologous structures a. are structures in two or...Ch. 21 - Convergent evolution a. is an example of...Ch. 21 - Prob. 6UCh. 21 - The possession of fine fur in 5-month human...Ch. 21 - In Darwins finches, a. occurrence of wet and dry...Ch. 21 - Prob. 2ACh. 21 - Convergent evolution is often seen among species...Ch. 21 - What conditions are necessary for evolution by...Ch. 21 - Explain how data shown in figure 21.2a and b...Ch. 21 - Prob. 3SCh. 21 - Refer to figure 21.5, artificial selection in the...Ch. 21 - The ancestor of horses was a small, many-toed...
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