BIOLOGY 101 – What is required for speciation to occur
1.What is required for speciation to occur?
Periods of rapid evolutionary change
Elevate Your Writing with Our Free Writing Tools!
Did you know that we provide a free essay and speech generator, plagiarism checker, summarizer, paraphraser, and other writing tools for free?Access Free Writing Tools
Long periods of time
Answer: Genetic isolation
2. The wing of a bird and the arm of a human are examples of ________ structures.
3. Homology is evidence of ______, while analogous structures are evidence of ______.
convergent evolution; common ancestry
punctuated evolution; divergent evolution
common ancestry; convergent evolution
paedomorphosis; stabilizing selection
Answer: common ancestry; convergent evolution
4. Below are examples of changes that occur in life. Which one is an example of biological evolution?
A cell starts to express a different set of genes when it is exposed to high levels of testosterone
Your taste in music changes dramatically between middle school and high school.
A young man’s muscles increase in strength and bulk after he starts lifting weights.
In New York City, the average wing length of pigeons decreases over a period of 150 years.
Answer: A cell starts to express a different set of genes when it is exposed to high levels of testosterone
5. The word “theory” in theory of evolution is best replaced by ________.
6. individual differences with a genetic basis lead to ______ in successive generations.
7. Which variable increases the likelihood of allopatric speciation taking place more quickly?
Equivalent numbers of individuals in each population
Increased instances of hybrid formation
Longer distance between divided groups
Lower rate of mutation
Answer: Longer distance between divided groups
8. Phylogeny is a description of ____________.
organisms on Earth
Answer: evolutionary history
9. Examine the phylogenetic tree. The organism at point C was ___________.
an ancestor that had some features now shared by both Archaea and Eukarya
an Archaean similar or identical to Pyrodicticum
a Diplomonad or similar eukaryote
Answer: an ancestor that had some features now shared by both Archaea and Eukarya
10. Complete the following analogy: Microevolution is to population as macroevolution is to ______________.
11. Microevolution is defined as _______________.
changes in the frequency of alleles in the gene pool
emergence of new species
changes in population size
changes in the composition of the population
changes in community size
Answer: changes in the frequency of alleles in the gene pool
12. Which of the scenarios below represent a gene pool that has changed through some process of microevolution?
A moth population increases from 3,000 individuals to 33,000 individuals over a period of favorable weather.
Your cells express different genes today than they did when you were born.
A mouse population (about 10,000 mice total) starts with 99% of the mice tan and 1% white; after 20 years 70% are tan and 30% are white.
Answer: A mouse population (about 10,000 mice total) starts with 99% of the mice tan and 1% white; after 20 years 70% are tan and 30% are white.
13. Geographic isolation could result from ____________.
all of the above
an ice age
Answer: all of the above
14. Elephants travel long distances in search of food. Using vibrations felt in the ground, family members traveling separately can communicate with each other. Based on your knowledge of evolution, the ability to communicate over long distances probably developed ___________________________.
slowly over millions of years
over a ten year period
as a strategy to decrease reproduction
as a way to communicate with humans
Answer: slowly over millions of years
15. After a disastrous blizzard, there was a significant increase in the allele frequency of blue eye color in Husky dogs. The frequency of alleles for brown-eyed dogs was 7.5% and the allele frequency for hazel-eyed dogs was 22.5% of all alleles for the population. What is the allele frequency percentage for the blue-eyed Husky dogs in this population?
16. A food poisoning outbreak is traced to a new strain of Salmonella bacteria that has a highly potent version of the enterotoxin protein. This toxin is partially responsible for the vomiting and diarrhea associated with Salmonella food poisoning. This is an example of ______________.
17. What are the similarity of fish, frog, bird, and human embryos evidence of?
Answer: Common ancestry
18. After a drought in 1977, the number of birds on Daphne Major Island decreased by ___________ times compared with the original population size.
19. The 1977 drought was followed by a significant increase in the proportion of medium ground finches with large bills. Based on the graphs, the mean (average) beak depth size approximately changed __________________.
from 13mm to 14.2mm
from 8mm to 13mm
from 9.5mm to 12mm
from 9.5mm to 10.2mm
Answer: from 13mm to 14.2mm
20. After the 1977 drought, the main finding about the medium ground finches on Daphne Major Island was that __________________.
fewer large-beaked finches survived
small-beaked finches outnumber large-beaked finches
the average size of their beaks increased
more large-beaked finches died
Answer: the average size of their beaks increased
More Solved math problems Devry MATH221 Week 1 Homework