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pishuonlain [190]
4 years ago
13

3.What is the difference between a dominant and a recessive trait?

Biology
1 answer:
Andreyy894 years ago
6 0

Answer:

Dominant traits are always expressed when the connected allele is dominant, even if only one copy of the dominant trait exists. Recessive traits are expressed only if both the connected alleles are recessive.

Explanation:

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A fellow student showed you a Gram stained slide where cell containing thick cell walls were stained pink. What would you tell h
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Answer:

Gram-negative bacteria

Explanation:

When the bacteria took pink color (safranine), it means they are gram-negative bacteria. Gram-negative bacteria have thick cell walls it does not take crystal violet stain as its cell wall is thicked. It take-up counterstain safranine and seen pink in the microscope.

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3 years ago
How does human evolution or natural selection relate to the susceptibility of disease?
Soloha48 [4]
Natural selection, is based upon the principle of "Survival of The Fittest" ensures that those who are more well adapted, especially having a better immune system, will survive. and the weaker ones will die out. Human evolution made the human immune system even better as time went by, and the system was more well adapted to diseases it was more exposed to like the Europeans were more resilient to smallpox than the native americans
4 0
4 years ago
In fruit flies, red eyes color (R) is dominated to brown (r), and normal spine (S) is dominated to spineless (s). Many flies are
frozen [14]

The percentage of progenies with red eyes and spine will be 56.25%.

<h3><u>Explanation:</u></h3>

This cross will be just similar to Mendel’s Dihybrid cross where he crossed the pea plants considering two characters at once.

Here two characters that are taken into account are eye colour and presence of spine. The eye colour has two traits - red and brown. Red colour is dominant. The presence of spine has also two possibilities - presence of spine or absence of spine.

The allele denoting red eye colour is R and allele denoting brown eye colour is r. Similarly, the allele denoting presence of spine is S and absence of spine is s.

Genotype of the heterozygous parents = RrSs.

Gametes produced by the parents= RS, Rs, rS and rs.

So crossing them, we get the phenotypic ratio of red eyed spined : red eyed spineless : brown eyed spined : brown eyed spineless = 9:3:3:1.

So, the percentage of red eyed spined = 56.25%.

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Which terms correctly identify the indicated structures in this
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Bioluminescenct organisms exist in deeper ocean depths because the light is unable to reach them.
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