Sexual reproduction. Sexual reproduction is more much complex than asexual reproduction. It requires the production of sex cells, or gametes , which have half the number of chromosomes of all other cells in the organism. ... Once the gametes are made in the male and female, they must meet with one another to form offspring
The correct answer is: b) directional selection
Directional selection is a type of natural selection in which an extreme phenotype is favored over other phenotypes. In this case, phenotype of large crickets will be favored, because they cannot be eaten by lizards. Large crickets are advantageous in surviving and reproduction. This will cause the allele frequency to shift over time in the direction of that large size phenotype.
He La cells have play important role in the study of cancer and even in cancer therapies. He La cells are also used to diagnose trisomic disorders such as Down's Syndrome with the help of chromosome banding. Some genes present in the He La cells are used as markers and compared with the other cell line in question. Presence of the marker for Down's syndrome in the cell in question shows that the person is suffering from the disease.
I think it is control group
Answer:
Scientific theories are based on large amount of evidence
Explanation: