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BIOLOGY 142 test 1 delgado Questions And Answers With 100% Correct Answers
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3. ________ isolating mechanisms prevent the fusion of gametes where as _______ isolating mechanisms prevent the proper functioning of the zygote. - Prezygotic, post zygotic • Adaptive radiation - o Existence of groups of closely related species that have recently evolved from a common ancesto...

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  • August 3, 2024
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BIOLOGY 142 test 1 delgado
3. ________ isolating mechanisms prevent the fusion of gametes where as _______ isolating
mechanisms prevent the proper functioning of the zygote. - Prezygotic, post zygotic



• Adaptive radiation - o Existence of groups of closely related species that have recently evolved
from a common ancestor by adapting to different parts of the environment. This is common in situations
in which species occur in an environment with few other species and many available resources.

o Adaptive radiation requires both speciation and adaptation to different environments

o Galapagos, mammalian evolution



▪ For natural selection to occur and result in evolutionary change, three conditions must be met: -
1. Variation must exist among individuals in a population.

2. Variation among individuals must result in differences in the number of offspring surviving in the next
generation.

3. Variation must be genetically inherited



1. The formation of one or more new species from an ancestral species called? - speciation



12. If a population of organisms natural selection favored both smallest and largest? - Disruptive
selection



13. What is it called when two species maintain reproductive isolation by using different components of
a habitat? - Ecological isolation



14. Lock and key fit of a dragonfly se organs is an example of - Mechanical isolation



15. Selection can reinforce reproductive isolation btw. 2 pop. By selecting against genes that would
encourage interbreeding btw. The 2 pops.? - true

, 16. Which of the following processes is geographic isolation a key component of ______ -
Allopatric speciation



17. Disruptive selection occurring in two populations a=that aren't geographically isolated from each
other could eventually lead to the formation of two new species - Sympatric speciation



18. Genetic drift, founder effects, and population bottlenecks can lead reproductive isolation -
true



2. A species is a group or groups of actually or potentially interbreeding natural populations which are
reproductively isolated from other groups. What is this statement>? - Biological species concept



20. The Cambrian explosion occurred about 500 million years ago before then there was no fossil
evidence - false

(p² + 2pq + q² = 1) - Hardy-Weinberg Equation

Equation used to calculate future genotype proportions in a population



21. The idea that reproductively isolated populations slowly accumulate differences until speciation -
gradualism



22. The idea that speciation occurs is a rapid bursts followed by long periods without change in species
called - Punctuated equilibrium



4. Which of the following is the mechanism that drives evolutionary change? - Natural selection



5. If an organism improves a particular trait during its life time, would this trait be passed on to the next
generation? - No, it wouldn't



7. Random changes in the nucleotide sequence of a gene is called? - mutation



8. Mating with relatives is an example of interbreeding - Decreases genetic diversity

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