Crossing over happens in Meiosis 1 only. In Prophase 1 a cells chromatin (chromatin = chromosomes that have not condensed yet) condense and pair up forming homologous chromosomes (paired = XX (2 chromosomes together)). When this happens segments/ alleles of the chromosomes pairing up swap over. This creates genetic diversity as each chromosome is different, it has parts from its pair. This leaves every chromosome unique and individual.
I hope this helps, sorry some of the vocab is rather technical. By the way I would suggest watching the
'Crash Course: Meiosis' on YouTube, this really helped me when I was learning this topic. :D
Codominance means that neither allele can mask the expression of the other allele. An example in humans would be the ABO blood group, where alleles A and alleles B are both expressed. So if an individual inherits allele A from their mother and allele B from their father, they have blood type AB.
The answer to this question would be: rapid impulse transmission.
By having organ near the head, the brain can process the information faster because the length of the nerve that carries the impulse from organ would be much shorter. The nerve also at lower risk of damage since it was shorter.
But it makes the head very important and damage to the head can cause much more problem than any part of the body.
Answer:
B, A, D, C
Explanation:
Deletion - loss of part of the DNA chromosome
Duplication - extra copy made of part of the chromosome
Inversion - reverses direction of the chromosome
Translocation - part of one chromosome attaches to another chromosome
Hi there!
I see that you are new, so let me be the first to say WELCOME TO BRAINLY!
I hope you enjoy it!
ANSWER:
the fundamental and distinctive characteristics or qualities of someone or something, especially when regarded as unchangeable <--- so that is the dictionary definition
DNA stands for deoxyribonucleic acid,
Hope this helps!
~CoCo
