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expeople1 [14]
3 years ago
14

How do the structure of adenine and

Biology
1 answer:
elena-14-01-66 [18.8K]3 years ago
6 0
Adenine forms two hydrogen bonds with thymine in DNA while three hydrogen bonds are formed between guanine and cytosine.

Thymine and cytosine are pyrimidines because they have a single ring structure. Adenine and guanine are purines because they have a double ring structure.
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A blue-eyed, left-handed woman marries a brown-eyed, right-handed man who is heterozygous for both of his traits. if blue eyes a
Pavel [41]
4 different phenotypes may be produced. If you write this down in a Punnet square you can get the exact ratio and the genotypes along with the phenotypes. 

Let us assign B for brown eyes, b for blue eyes; H for right-handed, h for left-handed. 
The mother's genotype will then be bbhh
The father's genotype will then be BbHh

           bh        bh         bh           bh
BH    BbHh    BbHh    BbHh      BbHh  
Bh     Bbhh    Bbhh     Bbhh      Bbhh
bH     bbHh   bbHh     bbHh      bbHh
bh      bbhh    bbhh     bbhh       bbhh

Now based on that you can see that there are 4 possible genotypic combinations which would express different phenotypic combinations as well. 

BbHh: Brown-eyed, right-handed
Bbhh: Brown-eyed, left-handed
bbHh:  Blue-eyed, right handed
bbhh:   Blue-eyed, left-handed

So again, there would be 4 possible phenotypes. 
3 0
4 years ago
Shelly is pessimistic about her future. Her disinterest for everything around her, together with worry and rumination, make it d
mezya [45]

Answer:

cognitive

Explanation:

The symptoms of depression are characterized into three broad groups  

1. Cognitive – The common symptoms observed include constant negative thoughts, pessimism, feeling guilty for all bad happenings around them, thinking of ending their life

2. Behavioral – These include behavioral changes occurring in a person facing depression such as poor hygiene, inefficiency in work, constant crying, anti-social thoughts and behaviour and low energy

3. Emotional – Under this head a person feel sad, lonely, worthless and hopeless.

7 0
3 years ago
Marcus is testing a hair sample from the telogen stage. What is likely to be TRUE about this sample? A. There will be several me
charle [14.2K]

Answer:

c

Explanation:

no explanation (plz give brainliest)

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If only a single member of a pair of chromosomes is present in a cell it is a. condition and is most likely a cell
emmainna [20.7K]
If only a single member of a pair of chromosomes is present in a cell it is a haploid condition and is most likely a reproductive cell.

Hope this helps!

-Payshence xoxo

8 0
3 years ago
How did orchid cloning change the way they where grown
Nonamiya [84]

Orchids are now grown through vegetative propagation, rather than seeds, courtesy of developments in cloning. This allows many orchid plants to be grown from a portion of a single orchid plant. This allows even the rare orchid o to be grown in mass. There is also little variation when cloning s done as compared to growing with seeds.

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