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Alex787 [66]
3 years ago
13

Which of the following is a true statement?

Biology
2 answers:
erik [133]3 years ago
8 0

Answer:

all organism need energy to live

ANEK [815]3 years ago
3 0

Answer:

all organisms need sunlight to make energy

hope this helps you ☺️☺️

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Q:- In dogs, the Mexican hairless phenotype never breeds true. When Mexican hairless are interbred the offspring are 2/3 hairles
drek231 [11]

Explanation:

The problem says that the hairless phenotype never breeds true. That means that it's not the result of a homozygous genotype (H₁H₁ or H₂H₂), so it is caused by the heterozygous genotype (H₁H₂).

The <u>expected </u>offspring from the cross between two Mexican hairless would be:

<h3>P                 H₁H₂  x  H₁H₂</h3><h3>F1    1/4 H₁H₁,  2/4 H₁H₂ and 1/4 H₂H₂.</h3>

And the <u>expected</u> phenotypic ratio 3:1. However, the observed offspring shows a 2:1 ratio. What's happening?

If the observed phenotypic ratio in the offspring of a monohybrid cross (a single gene with two alleles) is 2:1, we can suspect that one of the genotypes is lethal in homozygosis and therefore does not appear in the progeny (the puppies are born dead).

If we proposed that the H₂ allele is lethal in homozygosis, then:

  • The H₁H₁ genotype would cause normal puppies --> 1
  • The H₁H₂ genotype would cause hairless puppies --> 2
  • The H₂H₂ is lethal and causes the death of puppies --> 0

The phenotypic ratios change to 2:1, as observed in the experiment.

7 0
3 years ago
What is the main idea of this text?
Bad White [126]

Answer:

A

Explanation:

The entire paragraph is about how advertisements consume us. And that is a pretty big impact. It says nothing about the quality, or the judgement we face that comes with advertisements.

3 0
2 years ago
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Arthropods like mites and ticks can transmit rickettsial diseases.
Nadya [2.5K]
Yes they can and many more
6 0
3 years ago
Why do we say that the basic solution containing copper sulfate is an indicator solution for protein?
juin [17]
We know that copper sulfate can be used in an experiment to test whether or not a protein is at hand, etc. Hope this helps!
6 0
3 years ago
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An effective strategy for stepping in if someone appears to need help is
LenKa [72]

Answer:

An effective strategy for stepping in if someone appears to need help is <u>directly check in with the person</u><u>.</u>

Explanation:

Many a time, our closed ones will be fighting battles we are unaware of. We are so busy in our lives that we either do not notice the problems of our loved ones or we just think that if they need help from us, they will ask it themselves. But we shall realize the fact that many people will not ask for help themselves due to certain reasons.

So, it is best to always check upon the persons you love if you think that they might need any help.

5 0
3 years ago
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