The outermost extraembryonic membrane that contributes to the formation of the placenta is the: MCQ with Answer and Explanation

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:
The ozone layer in the stratosphere protects Earth from harmful ultraviolet (UV) radiation. Its depletion is primarily caused by Chlorofluorocarbons (CFCs), which were widely used in refrigerants, aerosols, and solvents. UV radiation breaks down CFCs, releasing chlorine atoms that catalytically destroy ozone molecules. The Montreal Protocol (1987) was an international treaty to phase out the production of CFCs.

Explanation:
Capillaries are the smallest blood vessels, with walls only one cell thick (endothelium), facilitating diffusion of oxygen, carbon dioxide, nutrients, and waste products between blood and tissues. Arteries and veins have thicker walls with smooth muscle and connective tissue. Capillaries form extensive networks (capillary beds) throughout the body.