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Are freckles hereditary?

Anyone can have freckles regardless of their genetic background, but the degree of freckles appearing on the face, shoulders and chest is hereditary. Although they are not a skin disorder, individuals who have them usually possess a lesser degree of the protective pigment melanin and should avoid overexposure to UV ultraviolet radiation.

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What are some uses of quicklime?

Scientists believe quicklime, or calcium oxide, may have been used in ancient Greece as a fire source. Since quicklime can ignite fuel when coming in contact with water, it may have been used to start cooking fires. It was once used in stage lighting because when heated to over 2,400 degrees Fahrenheit, calcium oxide emits a bright glow, called a limelight.Quicklime is also used in the petroleum industry as an alkali in biodiesel production.

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What are the receptors for vision?

Dr. Kimball further states that the rods have extreme sensitivity to light, but they only provide a coarse picture in black and white tones. Cones, on the other hand, provide sharper images, but they are not as sensitive as rods. Each of the three types of cone receives a different wavelength of light: red, green or blue. Most of the cones are amassed at the fovea, a small area of the retina that gives the sharpest vision.

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What does kimberlite look like?

Kimberlite is generally poor in the minerals most often found in igneous rocks because it forms at extreme depths. Rising from 100 to 135 miles under the surface, kimberlite magma tends to scrape other rock types from the walls of its chamber and incorporate them into its matrix. This process is responsible for its very rough, asphalt-like texture. Kimberlite samples sometimes contain garnets and diamonds, which also sets them apart from more common igneous rocks.

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What is astrophysics?

Generally speaking, astronomy measures the specific positions, movements and characteristics of interstellar bodies, whereas astrophysics attempts to determine more about the nature or physics behind these features. Cosmology is closer related to astrophysics, as it attempts to achieve these same goals on a much larger scale, studying the physics of entire universes and other large celestial bodies.\nAccording to NASA, the goals of astrophysics are to better understand the origins of the universe, how planets and other celestial bodies are created and how the universe functions as a whole. Ano..

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When is a metal referred to as malleable?

There are many other physical properties used to distinguish metals from nonmetals, such as luster, ductility and electrical and thermal conductivity. Metals have a shiny or lustrous appearance, are ductile and also are good thermal and electrical conductors.Comparing the physical properties of metals to nonmetals, the latter are brittle, non-ductile and not malleable. If a nonmetal is a solid, it is often dull in appearance. At room temperature, metals are in solid form, whereas nonmetals can be in one of the three phases, which are solid, gaseous or liquid.

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What is the difference between mitosis and meiosis?

Following are the steps involved in mitosis and meiosis:\nProphase: The nucleus is preparing to divide.\nMetaphase: The chromosomes line up in the middle of the nucleus and are ready to be pulled apart.\nAnaphase: The chromosomes are physically split and are moved away from the center. \nTelephase: The processes that occurred in prophase are reversed, and the new cells are formed.

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What is an intermediate phenotype?

Intermediate phenotypes are quite common throughout the living world. Most people express a phenotype that is intermediate from their parents in many ways. However, organisms that possess intermediate phenotypes may also display traits that are dominant or recessive. For example, two human children may simultaneously exhibit dominant or recessive traits and those of an intermediate phenotype. The eye color of the children is largely the result of dominant and recessive genes. By contrast, the children’s height, weight, hair color, intelligence and many other traits are generally examples of ..

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Where is your appendix located?

The purpose of the appendix is unknown. Sometimes it becomes inflamed and infected and may rupture, necessitating surgery to remove the appendix. An inflamed or infected appendix results in a condition known as appendicitis. Appendicitis is indicated by pain around the navel or on the lower right-hand side of the abdomen. Nausea and vomiting often accompany the pain.

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What are some facts about fossils?

The oldest fossil ever discovered, a specimen of blue-green algae that was found in South Africa, is over 3.2 billion years old. Algae and other single-cell organisms are also the smallest types of fossils. As of 2014, the oldest known dinosaur fossil is of a prosauropod that was found in Madagascar; the animal lived more than 230 million years ago.\nThe smallest dinosaur fossil ever found was a 12-inch-tall Microraptor that was discovered in China. By looking at fossil records, scientists have theorized that an asteroid hit the Earth approximately 65 million years ago. Most mammal fossils tha..

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