Question

Scientific evidence indicates that H. erectus were the first hominids to emigrate from Africa. Which of the following would most likely bring the reliability of this information into question?

Answer 1

What are the choices for the test?

Answer 2

DNA analysis showing H. erectus and modern humans did not have a common evolutionary ancestor

An archaeological dig finding fossil remains of A. africanus in Europe and Asia

Finding tools used by H. erectus in continents other than Africa

A discovery of fossils of H. erectus showing that they walked upright

Answer 3

C because the others really have nothing to do with it c:

Answer 4

okay that was what i was leaning towards, thank you!!

Answer 5

I took this test 2 months ago^^

Answer 6

no problem!

Answer 7

do you know this one?
Although most gray squirrels have gray fur, sometimes individuals with white or black fur are born. If a white-furred individual were born in a population of gray squirrels living in a Florida forest, what would be the most likely long-term consequence of its presence for the squirrel population if the forest remained unchanged for the next several generations?

Answer 8

The population would very quickly become predominantly white since the white squirrels would be camouflaged against the sand.

The number of white squirrels in the population would slowly increase as the original white squirrel produced white offspring.

The population would remain primarily gray, and the white squirrel would likely get eaten prior to adulthood.

The white squirrel would draw more predators to the area since it was more visible, and many gray squirrels would get eaten.

Answer 9

C because thats the only one that relates to the information given^^

Answer 10

alright thanks! this stuff confuses me!
haha

Answer 11

No problem^^ glad to help!

Answer 12

would you mind another question? haha sorry i dont wanna bother!

Answer 13

Oh no problem^^ I'm procrastinating today anywais!

Answer 14

Darwin noticed differences in the beak shapes of finches on the various islands of the Galapagos and surmised that they all might have evolved from a common ancestor on the mainland. If Darwin had known about molecular biology, a field of study that did not exist at the time he lived, how might he have used it to test his hypothesis?

Answer 15

He could have done DNA tests on the birds to see how closely they were related.

He could have checked to see if they shared similar cellular structures indicating their common ancestry.

He could have used modern tools to make more accurate measurements of beak shape and size.

He could have genetically engineered finches with extreme beak shapes to see how they survived.

Answer 16

A that would be the most efficient way of determining relation^^

Answer 17

THANK YOU! could i ask another? loll sorry :p

Answer 18

Not a problem! ASK AWAYYY! :DD

Answer 19

Scientific evidence, including the ability to determine the age of rocks, has led to the discovery that Earth’s continents were once one land mass that has since been separated. Which of the following best describes how this discovery might be useful in understanding evolutionary theory?

Answer 20

It showed how mountains could form a barrier that would be difficult for organisms to cross.

It explained what makes the continents drift around and isolate the organisms living on them.

It provided a set of rocks of known age to which others in different places could be compared.

It suggested that more recently evolved organisms might be found in the oldest rocks.

Answer 21

B the others are basically COMPLETELY unrelated to the topic.

Answer 22

i dont understand this question because the lesson confused me : Each of the following answer choices compares a segment of DNA from two related species that diverged from a common ancestor. Assume a mutation rate of two mutations per 60 million years applies to all segments and that a mutation can happen only once at each position in a DNA sequence. Which pair of sequences shows that the two species diverged from their last common ancestor 60 million years ago?

Answer 23

TATTCGCG and TGTCTGCA

GCGCTTAT and ACGTTTGT

GATTCACT and AACTCACT

TCACTTAA and TCACTCAA

Answer 24

Okay I admit I do NOT remember learning this...hmm one second let me check the website.

Answer 25

okay thanks its in 5.03

Answer 26

is it honors??

Answer 27

yes

Answer 28

That would make sense okay one second

Answer 29

okay!

Answer 30

It would be A I'm like 89% sure but let me go over it again

Answer 31

alright!

Answer 32

hmmm it might be the one with 3 changes in it though...

Answer 33

Go with B!

Answer 34

okay i will! thank you! Ready for another? lol

Answer 35

Yeh sure^^

Answer 36

A small population of 100 deer has become established on an island that is usually inaccessible from the mainland. Over time a recessive trait for white fur color has become common among them. Of the 100 deer, 64 have white fur. After the young are born the next year, the frequency of the white allele in the population increased to 81%. How has the frequency of the white allele changed between the two generations, and what is most likely to happen to the brown allele in future generations?

Answer 37

The white allele has increased by 17 percent, and it will likely outcompete the brown allele soon since natural selection favors it.

The white allele has increased by 10 percent, but the brown allele will probably start increasing in future generations since it is dominant.

The white allele has increased by 10 percent, and it is possible the brown allele could be lost to genetic drift or nonrandom mating.

The white allele has increased by 17 percent, but it may or may not continue to increase depending on future mating combinations.

Answer 38

A. That ones easy because obviously white is doing better and it increased 17% the area is probably more white then brown so brown will die off

Answer 39

okay! greatttttt another one of those sequence questions! :( The mitochondrial DNA sequence that is shared by two species has a steady mutation rate. Scientists determine the sequences of these two species to be as follows:

Species A: CAGGCCATTATG
Species B: CCAGCCTATAGG

This DNA sequence has a known mutation rate, which the scientists used to calculate that the species diverged from a common ancestor 80 million years ago. Using this information, how much more time do you predict will pass before these species differ by a total of eight base pairs?

Answer 40

160 million years

32 million years

48 million years

240 million years

Answer 41

48.

Answer 42

NO!! one second

Answer 43

okay!

Answer 44

say 170

Answer 45

that isnt an option though

Answer 46

er 160

Answer 47

okay! sorry i am almost done. just wanna make sure i am right!
Lamarck noticed that giraffes used their extremely long necks to reach the leaves high up on acacia trees, which other animals could not reach, giving them a food source for which they had few competitors. In developing his theory about natural selection, what did Lamarck infer from this observation?

Answer 48

Giraffe necks would get longer over a lifetime of stretching, and their offspring would inherit the longer necks of their parents.

All giraffes were born with short necks, but eating acacia leaves would cause them to stretch over a lifetime.

The first giraffe to evolve had a long neck and passed the trait to its offspring with no further change in the species since.

Only the giraffes with the longest necks would survive and be able to produce offspring.

Answer 49

D I know thats the only choice because the others are nonsensical

Answer 50

forgot to press post XD

Answer 51

haha okay! Which of the following can be inferred from the differences between the skulls of Australopithecus afarensis and Homo neaderthalensis?

Answer 52

Australopithecus afarensis had a longer skull than Homo neaderthalensis and was the first hominid to create tools.

Australopithecus afarensis had a more pronounced nose than Homo neanderthalensis, suited to breathing cold air.

Homo neaderthalensis was taller than Australopithecus afarensis and was able to walk upright first.

Homo neaderthalensis had a larger cranial capacity than Australopithecus afarensis and had a larger brain.

Answer 53

One second I have this in my notes

Answer 54

okay

Answer 55

C because I can rule the others out based on their typical behaviors listed in my notes.

Answer 56

okay! two more haha :p Which of the following best explains a way that a molecular clock can be used?

Answer 57

The number of DNA mutations in an organism is measured over time to determine how long it will take for a new species to evolve.

The number of DNA mutations in a species is compared to the number of DNA mutations in another species to determine the relative amount of time each species has been evolving.

The number of differences in a specific DNA sequence of two species is multiplied by a known mutation rate to determine the number of years of evolution that separate the two species.

The number of differences in the DNA sequences of two organisms of the same species is averaged to determine how many years of evolution have occurred.

Answer 58

B or C which one do you think would make more sense based on what you know?

Answer 59

umm b, is that right?

Answer 60

Good job^^

Answer 61

thanks! :D last one!
Based on fossilized evidence, there are scientific claims made about the evolution of certain species. If a scientist studying the fossils of a specific species had a hypothesis other than what was currently accepted, what steps should be taken to have the alternative hypothesis considered

Answer 62

Since the original hypothesis is untestable given the circumstances, another one is more likely to be correct.

If an alternative hypothesis sounds plausible it could be used in place of the original hypothesis.

The scientist should publish the alternative hypothesis in a popular magazine to gain public support.

It is useful to test alternative hypotheses and know that they are incorrect.

Answer 63

B I'm pretty sure because C is the only other plausible one and they told us that was never a good choice so B.

Answer 64

alright thanks for all the help!

Answer 65

No problem! sorry if you get a bad grade D:

Answer 66

i got a 20/40. some i did on my own so i will retake the test later!

Answer 67

Yeah I never do good on those tests v.v but I have an 87 and I'm finishing this week :D