The blood vessel that carries oxygenated blood from the placenta to the fetus is the: MCQ with Answer and Explanation

Explanation:
RNA polymerase recognizes and binds to the promoter region of DNA, which is located upstream of the coding sequence. This initiates transcription. The terminator signals the end of transcription. Start codon (AUG) is on mRNA where translation begins. Enhancers are regulatory DNA sequences that increase transcription but are not the primary binding site for polymerase.

Explanation:
Color blindness is an X-linked recessive disorder. Let X^c be the colorblind allele and X^C be the normal allele. The colorblind man's genotype is X^cY. The carrier woman's genotype is X^CX^c. When they have children, the sons will receive the Y chromosome from the father and one X chromosome from the mother. The mother can pass either X^C (normal vision) or X^c (colorblind) with equal probability. Therefore, there is a 50% chance (1/2) that a son will inherit X^cY and be colorblind.

Explanation:
Myopia, or nearsightedness, is a refractive error where distant objects appear blurry, but near objects are clear. It occurs when the eyeball is elongated (axial myopia) or the cornea/lens is too curved (refractive myopia), causing light rays from distant objects to focus in front of the retina instead of directly on it. It is corrected using a concave (diverging) lens. Hypermetropia is the opposite, corrected with a convex lens.