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olya-2409 [2.1K]
2 years ago
14

SOMEONE HELP 15 POINTS!!!

Biology
1 answer:
Lyrx [107]2 years ago
8 0
What do you need help with ? I don’t see anything
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Consider two different traits in mice affecting tail length and fur color. A two-factor cross was made involving true-breeding m
Stells [14]

Answer:

See the answer below

Explanation:

Null hypothesis: The two genes are independently assorting and therefore, are not linked to each other.

Let A represents the allele for tail length and B for fur color. Long-tail A is dominant over short tail a while brown fur B is dominant over white fur b.

For the first cross involving true-breeding mice:

    AABB   x   aabb

F1         AaBb (long tails and brown fur)

For the second cross:

      AaBb   x   aabb

4 AaBb - Long-tail, brown fur

4 Aabb - Long tail, white fur

4 aaBb - short tail, brown fur

4 aabb - short tail, white fur

Since the phenotypic ratio from the cross is 1:1:1:1, if the null hypothesis was to be true, it means that the expected phenotype ratio should be 1:1:1:1.

In order to test this hypothesis, we use Chi-square:

phenotype                           O            E                 X^2  

Long-tail, brown fur           118          97.5        \frac{(118-97.5)^2}{97.5} = 4.31

Long tail, white fur              77           97.5             4.31

short tail, brown fur             81           97.5              2.79

short tail, white fur              114           97.5              2.79

Total                                                                          14.2

Degree of freedom = 4 - 1 = 3

Critical Chi-square value = 7.815

The calculated Chi-square value is more than the critical value, hence, the null hypothesis is rejected.

8 0
3 years ago
Which of the following is not part of the modern cell theory?
yawa3891 [41]

Answer:

Each cell has a unique chemical composition

Explanation:

All the other answers are apart of the modern cell theory.

5 0
3 years ago
Snapdragons, a flowering plant popular with gardeners, can have red, white, and pink colored petals. When snapdragons with red p
Alex787 [66]

Answer:

I think it is called selective breeding, I don't think it is called that but hope this helps

7 0
3 years ago
Read 2 more answers
Please help I’ll give brainliest
Gekata [30.6K]
Temperatures are rising world-wide due to greenhouse gases trapping more heat in the atmosphere.

• Droughts are becoming longer and more extreme around the world.

• Tropical storms becoming more severe due to warmer ocean water temperatures.

• As temperatures rise there is less snowpack in mountain ranges and polar areas and the snow melts faster.

• Overall, glaciers are melting at a faster rate.

• Sea ice in the Arctic Ocean around the North Pole is melting faster with the warmer temperatures.

• Permafrost is melting, releasing methane, a powerful greenhouse gas, into the atmosphere.

• Sea levels are rising, threatening coastal communities and estuarine ecosystems.

4 0
3 years ago
I do this work negative​
skad [1K]

Answer:

what?

Explanation:

i dint get it is there a joke or somthing

5 0
2 years ago
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