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Bezzdna [24]
4 years ago
8

·four valence electrons

Biology
2 answers:
Helen [10]4 years ago
7 0
The answer is carbon, hoped this helps you!
Anika [276]4 years ago
5 0
The answer is A. Carbon
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Assume that the mother's genotype is AZ/az, and the father's genotype is Az/aZ, and the recombination rate is 10%. What are the
Varvara68 [4.7K]

Answer:

.45 from mom, .05 from dad

Explanation:

Given that:

the mother's genotype is AZ/az

i.e AZ = 50%

az = 50%     (parental)

But  we  were also told that the recombination rate is 10% which will like wise affect the mother's genotype

So 100% -10% = 90 % of the mother's genotype

We have a new genotype

AZ = 45%

az = 45% (parental)

Therefore the probability of az gamete from the mother = \frac{45}{100}

= 0.45

Similarly; the genotype of the father is:  Az/aZ

This is an heterozygous father who is diploid hence, there is a remarkable presence of two copies of each autosomal chromosome.

Az is the allele of the genes in one chromosomes and aZ is the allele of the genes in the other.

The gametes of this self cross are: Aa, AZ, az, zZ

Therefore; the recombinants are:

AZ

az

Since there are 10% recombinant; then

AZ = 5%

az = 5%

Therefore the probability of az gamete from the father = \frac{5}{100}

= .05

4 0
4 years ago
Why do you think DNA is duplicated before
Anna71 [15]

The two cells that result from a single cell need to have the same amount of genetic material as the initial cell, therefore the DNA needs to be duplicated before the cell divides.

The sister chromatids are attached together so that during anaphase the daugther cells will receive the same chromosomes

5 0
4 years ago
Describe the hygiene hypothesis and the role that eosinophils play in it. Why does having a parasitic worm help us
Ilya [14]

In medicine, the hygiene hypothesis states that early childhood exposure to particular microorganisms (such as the gut flora and helminth parasites) protects against allergic diseases by contributing to the development of the immune system.

<h3>What is the role of eosinophils in hygiene hypothesis ?</h3>

Eosinophils are multifunctional granulocytes that contribute to initiation and modulation of inflammation.

  • Eosinophils are extremely versatile effector cells that damage tissues or modulate the activity of other immune and stromal cells.
<h3>Why does having a parasitic worm help us ?</h3>

This is because parasitic worms have evolved strategies to block parts of the human immune system.

  • These parts of the immune system, namely the eosinophils and IgE antibodies, are also the main players in allergies, IBD, and many other inflammatory diseases

Learn more about hygiene hypothesis here:

brainly.com/question/15188231

#SPJ4

8 0
2 years ago
Which of the following is located in the interstitial spaces within tissues and releases nutrients, immune factors, and oxygen t
goldfiish [28.3K]

Answer:

The correct answer will be option -capillaries.

Explanation:

The circulatory system of the human body is made up of vessels which carry the lymph and blood in the body. There are three types of vessels present in the body: artery, veins and capillaries.

The artery supplies oxygenated blood from the heart to the body organs which are divided into the minute capillaries in the interstitial spaces of the tissues and provide oxygen and nutrients to the tissues. the carbon dioxide is diffused into these capillaries which are transported to the veins and carries back to the heart.

Thus, option-capillaries is the correct answer.

5 0
3 years ago
Giraffes are also vertebrates, like humans. In fact, despite their different neck sizes, humans and giraffes have exactly seven
Nana76 [90]

Answer:

giraffes necks consists a tall bone like structure called notochord which gives support to the skeletal system like how do we have backbone

3 0
3 years ago
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