1. Echolocation is the ability to use sound waves that bounce of off objects to
ID: 191121 • Letter: 1
Question
1. Echolocation is the ability to use sound waves that bounce of off objects to locate those objects. Bats and dolphins both have the ability to echolocate. However, this is not a trait that they inherited from a common ancestor. Therefore, the ability of dolphins to echolocate is an example of A. B. a homologous trait a homoplastic trait You observe a single cell organism under the microscope and notice that it lacks a nuclear envelope. What other information would be useful in classifying this ANSWERS CAN BE CHOSEN! 2. organism into one of the three domains? MULTIPLE It contains a circular chromosome. B. Its cell membrane contains fatty acid. C. Its cell wall lacks RGRuawk D. It can exchange genetic Imagine a population of dragons with green and blue skin. Blue is dominant to green. There are 65 bomozezou dominant individuals, 25 heterozygous individuals, and 10 homozygous recessive individuals. Which of the following is the frequeney of the recessive allele for this population of dragons? 3. A. 0.78 B. 0.65 C.0.25 D. 0.23 4. Monarch flycatchers are birds. There are two different populations of Monarch flycatchers on the Solomon Islands. One population, called black flyeatchers, has all black feathers. The other population, called chestmut-bellied flycatchers has black feathers with a chestmut colored belly. The phylogenetic tree of birds related to Monarch flycatchers is shown below. Each tip of the tree shows a male and female bird for that taxon·The location of chestnut-bellied flycatchers and black flycatchers on the tree are labeled. Chestnut-bellied flycatchers Black flycatcher Rennell shrikebill A. B. No Not enough information |
Explanation / Answer
1.
Option B is correct.
A homoplastic trait is shared by two or more taxa for any reason other than that they share a common ancestor.
2.
All options are correct.
a. Most prokaryotes contain circular genomes while eukaryotes contain linear genomes.
b. Fatty acid composition and linkage is different in different groups.
c. Gram-positive bacteria contain peptidoglycan cell wall (>50%)
d. Only a few prokaryotes can exchange genetic information by horizontal gene transfer methods.
3.
Blue = Dominant = BB = 65
= 130 B alleles
Blue = Heterozygote = Bb = 25
= 25 B alleles and 25 b alleles
Green = Recessive = bb = 10
= 20 b alleles
Frequency of b allele = (Number of b alleles X 100)/Total number of alleles
= 4500/200
= 22.5%
= 0.225
= 0.23
4.
Bottleneck effect: If a small population is separated by a natural event (Ex: hurricane) from its main group, it may experience new environmental conditions and accumulate new mutations/adaptations.
The frequency of alleles in the founder population can be different from the original group (It is a chance event).
So, certain alleles in the founder population may get overrepresented and they evolve into a different species due to differential selection pressure.
Hence option A is correct.
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