If crossing over did not occur during meiosis, there would be less genetic variation within a species. With crossing over, potentially every chromosome could consist of a combination of both maternal and paternal alleles, which, along with random segregation of chromosomes during anaphase II, would result in a nearly limitless number of genetic variations between related individuals and within a species.
Without crossing over, each chromosome would be either maternal or paternal, greatly reducing the number of possible genetic combinations, which would greatly reduce the amount of genetic variation between related individuals and within a species.
And as genetic variation decreases, the species has a very less chance to evolve and adapt as natural selection.
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Answer:
the RRRGENTS
Explanation: The human body does Regulation, Excretion and Synthesis
Answer:
Genotype can be described as the genetic makeup of an organism. Phenotype can be described as the physical characteristics which are observed in an individual.
Our genotype influences our phenotype.
For example, lets consider a male parent to be homozygous for brown eye colour which is dominant, BB. The female parent has blue eye colour and is recessive, bb.
Let's make a punnet square,
b b
B Bb Bb
B Bb Bb
The results from the punnet square tell that all of the offsprings will have heterozygous genotype Bb, and the phenotype will be brown eyes.