1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Ugo [173]
3 years ago
8

What additional information would assist you in determining whether polar bears and grizzlies are different species, based on th

e biological species concept?
I. whether the F1 is fertile
II. whether F1 offspring are viable
III. the amount of DNA sequence divergence between polar and grizzly bears
IV. the geographic distribution of polar and grizzly bears

a. II only
b. I only
c. III and IV only
d. I and III only
e. I and II only
Biology
1 answer:
ladessa [460]3 years ago
5 0

Answer:

The correct answer is- e. I and II only

Explanation:

According to the biological species concept, a species is the population of organism in which the individual are able to interbreed with each other and also able to produce viable and fertile offspring.

Therefore here to determine whether polar bears and grizzlies are different species we have to get information that whether the F1 generation of grizzlies and polar bears is viable and able to produce their own offspring that means are F1 generation fertile. So the correct answer is e. I and II only.

You might be interested in
How much of the ocean has been explored
Mnenie [13.5K]

Answer:

Approximately five percent of the ocean has been discovered, which leaves 95 of the ocean unexplored. Depending on who you ask, there exists not one—but two—final frontiers of discovery.

5 0
3 years ago
An additional gene, gene W, was also examined. A test cross was made between true-breeding EEWW flies and EEWW flies. The result
Debora [2.8K]

This question is incorrect but here is the correct question below;

An additional gene,gene W was also examined. a test cross was made between true breeding EEWW flies and eeww flies. The resulting F₁ generation was then crossed with eeww flies. 100 offspring in the F₂ generation were examined and it was discovered that the E and W genes were not linked.

Which is the correct genotype of the F₂ offspring if the genes were linked and if the genes were not linked?

a) Linked: 50% EeWw and 50% eeww; not linked: 25% EeWw, 25% Eeww, 25% eeWw and 25% eeww.

b) Linked: 25% Eeww, 50% eeWw; not linked:parental genotypes EeWw and eeww.

c) Linked genotypes (EeWw and eeww) and recombinant genotype ( Eeww & eeWw) in the F₂ generation are nearly the same irrespective of their linkage.

d) Linked: mostly with parental genotypes, Eeww and eeWw; unlinked: 25% EeWw and eeww with 75% Eeww and eeWw.

Answer:

a) Linked: 50% EeWw and 50% eeww; not linked: 25% EeWw, 25% Eeww, 25% eeWw and 25% eeww.

Explanation:

a test cross was made between true breeding EEWW flies and eeww flies

If EEWW self crossed, we have the following ( EW, EW, EW, EW)

Also, for eeww, we have ( ew, ew, ew, ew)

                   

                    EW                   EW                     EW                   EW

ew               EWew               EWew               EWew               EWew      

ew               EWew               EWew               EWew               EWew

ew               EWew               EWew               EWew               EWew

ew               EWew               EWew               EWew               EWew

All offspring are  (EWew)

The question goes further by saying "The resulting F₁ generation was then crossed with eeww flies".

And we are asked to find the correct genotype of the F₂ offspring if the genes were linked and if the genes were not linked

∴

To determine  the offsprings of the linked genes we need to go by the definition and understand what linked genes are: Linked genes are genes that are physically close together on the same chromosomes. Effect of recombinantion on linked genes, results in gene swaps which occur in chromosomes that are homologous.

Having said that; If  EWew × eeww

we have;                 EW   &   ew    ×    ew  &    ew

           EW               ew

ew       EeWw          eeww

ew       EeWw          eeww

offspring that

are linked in   ⇒     EeWw    EeWw     &      eeww      eeww

F₂   will be

\frac{1}{2} = 50% of EeWw of the total 100 offspring in the F₂ cross

\frac{1}{2} = 50% of eeww of the total 100 offspring in the F₂ cross

∴ Linked genes =  50% EeWw and 50% eeww.

For unlinked genes; If  EWew × eeww

if rearrangement occurs in EWew  and EWew self crossed, we have ( EW,Ew,eW,ew) as the traits needed for the unlinked gene F₂ crossing.

Also ewew will be (ew, ew, ew, ew).

                       EW                    Ew                    eW                    ew

ew                  EeWw               Eeww                eeWw                eeww

ew                  EeWw               Eeww                eeWw                eeww

ew                  EeWw              Eeww                 eeWw                eeww

ew                  EeWw              Eeww                 eeWw                eeww

We have the following results for the unlinked genes

\frac{1}{4} = EeWw  25% of the total 100 offspring in the F₂ cross

\frac{1}{4} = Eeww   25% of the total 100 offspring in the F₂ cross

\frac{1}{4} = eeWw   25% of the total 100 offspring in the F₂ cross

\frac{1}{4} = eeww    25% of the total 100 offspring in the F₂ cross

∴ not linked: 25% EeWw, 25% Eeww, 25% eeWw and 25% eeww.

3 0
2 years ago
What is the answer im not sure
luda_lava [24]

Answer:

A

Explanation:

5 0
3 years ago
5)
STatiana [176]

Answer:

D) the cell appears to be in a rectangular shape and has a cell wall

Explanation:

animal cells don't have cell walls

7 0
3 years ago
What is true about electromagnetic waves that is not true about mechanical waves?
8090 [49]

Answer:

electromagnetic waves can travel in a vacuum

Explanation:

4 0
2 years ago
Other questions:
  • Which of the following would likely extend the Earth's supply of a nonrenewable resource? a decrease in its market price a new t
    5·2 answers
  • How many chromosomes does a coyote have
    13·2 answers
  • What happens in cellular respiration if there is not enough oxygen
    12·1 answer
  • What are the characteristics of a buckeye leaf?
    11·2 answers
  • 4. What is viscosity and how is it related to blood flow?
    7·1 answer
  • all plants give out oxygen during day and carbon dioxide during night. Do you agree with this statement. Give reason
    8·1 answer
  • Do your experiments suggest that mushrooms are decomposers (organisms that break organic matter down to simpler, inorganic matte
    5·1 answer
  • Which inference can be drawn based on the information in the advertising?
    14·1 answer
  • Classify the glands as endocrine or exocrine glands.
    5·1 answer
  • Fill in the blank
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!