Hi there!
A prezygotic isolating mechanism is a mechanism that causes something to happen, not allowing the organisms to breed before fertilization. I'll explain each one for you.
A - That is postzygotic because the organisms were not stopped before fertilization. The result is a sterile organism.
B - Again, that is postzygotic because the organism was produced.
C - This is prezygotic! The sperm dying shows that something is in action to prevent fertilization, meaning that it cannot happen.
D - Fertilization was successful, so it is postzygotic.
ANSWER:
C - the sperm dies when it reaches the female tract
If you need help with any more problems, feel free to message me and I'd be more than happy to help you work through them and provide explanations.
Hope this helps!! :)
If there's anything else that I can help you with, please let me know!
GGC-CAT - strand of DNA
xxx- xxx - strand of mRNA
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The first, let's see what connect with what:
when we talk about DNA and complementary strand of DNA:
guanine connects to cytosine (and vice versa)
thymine connects to adenine (and vice wersa)
when we talk about DNA and complementary strand of RNA:
guanine connects to cytosine (and vice wersa)
adenine (in DNA) connects to uracil (in RNA)
thymine (in DNA) connects to adenine (in RNA)
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GGC- CAT - strand of DNA
<span>CCG- GUA - complementary strand of mRNA
</span>complementary strand of DNA would be: CCG- GTA
(in complementary strand of RNA: thymine is replaced with uracil)<span>
</span>Greetings,
n00nst00p :)
Answer:
Every gene has a code which is responsible for the formation of thousands of protein necessary for normal functioning of the cell.
Explanation:
In genes codes are present. In these codes have information about the formation of protein. Genes is just like a recipe book which contains information about making different types of protein which is necessary for the cell. So codes in the genes are work according to the instruction of the cell for making a specific protein. These codes contains characters which is sent by the genes to the ribosomes of the cell where protein are formed.
It is critical to divide the chromosome number in half prior
to reproduction in order to make sure that there will be a balance amount of
chromosome present. There should be an
equal number of chromosomes from each parent, if not, there will be some
abnormalities.