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Polar bodies serve to eliminate one half of the diploid chromosome set in meiotic division in the egg, leaving behind a haploid cell. That means that 23 pairs (46) of chromosomes are going to be separated equally, 23 for the polar body and 23 for the egg cell. In case of trisomy 18, the division is not equal. Instead, the egg cell receives 23 +1 chromosomes and the polar body receives 23 - 1= 22 chromosomes.
That chromosome that was misplaced is the chromosome 18.
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Answer:
The answer is D: Recombinant DNA is produced by pasting together DNA from two sources
Explanation:
Recombinant DNA, or rDNA, is made by pasting together 2 halves of DNA strands from different sources
Answer:
A) air
Explanation:
air is a mixture of various gases ...
Answer:
Option C
Explanation:
If we consider Darwin's theory we would realize that the species which are not able to survive are unfit or weak. Thus, predators usually attack species that can be easily targeted. Hence, it this way predation leads to selective pressure on any species and hence leads to creation of a fit gene pool. The weak organisms are removed and more fit organism could mate among themselves to produce healthy offspring.
Hence, option C is correct