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Aleks04 [339]
3 years ago
10

What is the role of retina?​

Biology
2 answers:
Mashcka [7]3 years ago
7 0

Answer:

It is where images are formed.

Explanation:

The retina has two light sensitive cells;

rods- responsible for dim light.

cones- responsible for bright light

REY [17]3 years ago
5 0
The role of the retina is to receive light that the lens has focused. It then converts the light into neural signals which get sent to the brain for visual recognition.
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The term is called Gonads.
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Which bone is not present in all five fingers?
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The hand has 27 bones what is not including the sesamoid bone, the number of which varies between people, 14 of which are the phalanges of the fingers and thumb. The metacarpal bones connect the fingers and the carpal bones of the wrist.
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Read 2 more answers
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.

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3 years ago
In humans, what muscle is homologous to the serratus ventralis found in cats
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