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| Fossils found in the lowest geological strata are generally the most __ |
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| Biologists define evolution as _____ . |
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Definition
| hertible change in a line of descent over generations |
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| The place Darwin visited on his trip around the world that had the greatest impact on his thinking was ___ |
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Definition
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| Georges Cuvier was a strong proponent of the theory of ___ |
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| In Argentina, Darwin noted the similarity of fossils of glyptodonts to modern ___ |
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| Which of the following evolve? |
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Darwin saw that populations of Galapagos finches _____ .
a. show variation in traits
b. resemble birds in South America
c. are adapted to different island habitats
d. all of the above |
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Genetic variation gives rise to variation in _____ traits.
a. morphological
b. physiological
c. behavioral
d. all of the above |
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| Which organism did Mendel use to work out the laws of segregation and independent assortment? |
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| A heterozygote has a _____ for the trait being studied. |
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Definition
| pair of nonidentical alleles |
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Term
| The observable traits of an organism are its _____ . |
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Definition
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Term
| If R is dominant to r, the offspring of the cross of RR with rr will ___ |
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Definition
| display the same phenotype as the RR parent |
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Term
| According to Mendel, what kind of genes "disappear" in F1 pea plants? |
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Definition
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Term
| The F2 phenotypic ratio of a monohybrid cross is ___ |
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Definition
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Term
| For Mendel's explanation of inheritance to be correct, ___ |
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Definition
| which gametes combine at fertilization had to be due to chance |
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Term
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Definition
| an F1 hybrid and an organism that is homozygous recessive for that trait |
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Term
| Second-generation offspring from a cross are the _____ . |
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Definition
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Term
| F1 offspring of the monohybrid cross AA x aa are _____ . |
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Definition
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Term
| Assuming complete dominance, the F2 generation following the cross Aa x Aa will show a phenotypic ratio of _____ . |
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Definition
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Term
| The usual F2 phenotypic ratio of a dihybrid cross is ___ |
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Definition
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| Crosses between F1 pea plants resulting from the cross AABB x aabb lead to F2 phenotypic ratios close to _____ . |
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Definition
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| A gene that produces multiple effects is called ___ |
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