Tutor profile: Madelene M.

What is grammatically wrong with the sentence "Ellos está en la parque" ?

There are two errors in this sentence. First, the verb estar has not been conjugated correctly. When conjugating a verb, the conjugation must match the subject. Since the subject is "ellos," the verb should be conjugated as "están" which is plural, rather than "está," which is singular. Second, "parque" is a masculine word in Spanish, so instead of "la parque," which implies that "parque" is feminine, the sentence should read "el parque."

Why is making an outline important when writing an essay?

Outlines help a writer organize their thoughts and arguments before beginning to write their essay. A good outline will start with the thesis statement and then be structured to include each paragraphs' main points. This helps the writer create a logical order for the essay and also helps to make sure that each paragraph fully supports the arguments made in the thesis. While making an outline may seem like an extra step to take in the essay writing process, in the long run it will generally be more efficient.

Why are men more likely to be red-green colorblind than women?

Men are much more likely to be red-green colorblind than women because the gene that determines red-green colorblindness is located on the X chromosome. Red-green colorblindness is caused by a mutation of this gene, and the mutation is recessive. Since women have two X chromosomes, if they inherit one copy of the mutated gene and one copy of the normal gene, the effects will be masked since the normal gene is dominant. However, since men only have one copy of the X chromosome, they only need one copy of the gene with the mutation to present with red-green colorblindness. Thus, men only need one copy of the mutation to be colorblind, while women need two. The gene causing colorblindness is an example of an "X-linked gene," which typically displays this kind of inheritance pattern.