Eighty percent of all collisions involve driver distraction within ______ seconds of the collision.

1 answer:

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Eighty percent of all collisions involve driver distraction within three seconds of the collision. Distracted driving is when an even, person, activity, or object draws a driver's attention away from the driving task. There are four categories of distarction; including cognitive, visual, auditory, and biomechanical disractions.

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How many chromosomes does a body cell for the organism (egg and sperm) have?

DiKsa [7]

Growth and repair
creation of gametes (sex cells)
method of reproduction in unicellular organisms
Binary Fission - type of reproduction that occurs in bacterial cells, single celled organism splits and becomes two identical organisms

Chromosomes and DNA

Chromosomes are DNA wrapped around proteins to form an X-shaped structure.

The diagram will help you see the relationship.

1. Chromosomes are found in the nucleus
2. Chromosomes are made of DNA
3. Sections of chromosomes are called genes

DNA - deoxyribonucleic acid (it is the genetic code that contains all the information needed to build and maintain an organism)

Chromosome Structure

Chromosome Numbers

Each organism has a distinct number of chromosomes, in humans, every cell contains 46 chromosomes. Other organisms have different numbers, for instance, a dog has 78 chromosomes per cell.

Somatic Cells - body cells, such as muscle, skin, blood ...etc. These cells contain a complete set of chromosomes (46 in humans) and are called DIPLOID.

Sex Cells - also known as gametes. These cells contain half the number of chromosomes as body cells and are called HAPLOID

Chromosomes come in pairs, called Homologous Pairs (or homologs). Imagine homologs as a matching set, but they are not exacly alike, like a pair of shoes.

Diploid cells have 23 homologous pairs = total of 46

Haploid cells have 23 chromosomes (that are not paired) = total of 23

Homologous Chromosomes

Sex Determination

Chromosomes determine the sex of an offspring. In humans, a pair of chromosomes called SEX CHROMOSOMES determine the sex.

If you have XX sex chromosomes - you are female

If you have XY sex chromosomes - you are male

During fertilization, sperm cells will either contain an X or a Y chromosome (in addition to 22 other chromosomes - total of 23). If a sperm containing an X chromosome fertilizes an egg, the offspring will be female. If a sperm cell containing a Y chromosome fertilizes an egg, the offspring will be male.

Creation of a Zygote

When two sex cells, or gametes come together, the resulting fertilized egg is called a ZYGOTE

Zygotes are diploid and have the total 46 chromosomes (in humans)

Karyotype

A karyotype is a picture of a person's (or fetus) chromosomes. A karyotype is often done to determine if the offspring has the correct number of chromosomes. An incorrect number of chromosomes indicates that the child will have a condition, like Down Syndrome

Compare the Karyotypes below

Notice that a person with Down Syndrome has an extra chromosome #21. Instead of a pair, this person has 3 chromosomes - a condition called TRISOMY (tri = three)

Trisomy results when chromosomes fail to separate - NONDISJUNCTION - when sex cells are created. The resulting egg or sperm has 24 instead of the normal 23.

Other conditions result from having the wrong number of chromosomes:

Klinefelters Syndrome - XXY (sex chromosomes)

Edward Syndrome - Trisomy of chromosome #13

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3 years ago

Using the table, which statement is true?

kirza4 [7]

Your answer would be B.

8 0

3 years ago

Which of these is an example of precipitation?

Ymorist [56]

Answer:

A. A steady drizzle falls in Pittsburgh.

Explanation:

Precipitation is any kind of weather in which something is falling from the sky.

A drizzle consists of small water droplets coming from the sky.

B, C, and D are wrong, because nothing is coming from the sky.

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3 years ago

Where is most of the baryonic matter (ordinary matter) of the universe found?

nalin [4]

Baryonic dark matter may occur in non-luminous gas or in Massive Astrophysical Compact Halo Objects, and stars. So therefore it’s D.

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3 years ago

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Which of the following statements about matter is true? Mass and matter are always the same. Matter is made up of atoms and has

-BARSIC- [3]

This statement about matter is true: MATTER IS MADE UP OF ATOMS AND HAS MASS.
Matter is defined as anything that has mass and occupies space. The mass of an object is the measure of the extent to which the object can resist a change in its direction when a force is applied to it. A matter is usually made up of atoms, which is defined as the smallest component of any matter. Therefore matter is made up of atoms and it has mass.

8 0

3 years ago

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