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Biology Review of Chromosome Theory 150 150 Deborah

Biology Review of Chromosome Theory

Overview:  What Is the Chromosome Theory? The results of Mendel’s experiments on cross-breeding pea plants led to principles of heredity, but he wasn’t able to observe either chromosomes or genes in cells.  Microscopes in his time weren’t strong enough to detect those features.  In the late 1800’s and early 1900’s, scientists observed the processes of…

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A Statistics Review of Confidence Intervals 150 150 Deborah

A Statistics Review of Confidence Intervals

Overview:  What Is a Confidence Interval? Unless the population is small enough to determine each member, researchers cannot know the exact value of the population mean.  However, using statistical techniques, it can be predicted that the mean falls within a certain range, called the confidence interval.  Using properties of sample size, standard deviation, and probability…

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A Biology Review of Mutations 150 150 Deborah

A Biology Review of Mutations

Overview:  What Are Mutations? Although the process of DNA transmission and replication is usually flawless in the next generation of cells, sometimes there are coding errors.   These errors pass on and are expressed in the next generation.  Sometimes they involve a single gene, and sometimes they involve an entire chromosome.  They are called mutations. What…

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A Review of Math Fundamentals: Place Value 150 150 Deborah

A Review of Math Fundamentals: Place Value

Overview:  Place Value and Numeration Systems The earliest representations of numbers were simple tally marks.  As long as the numbers involved were not very large, tally marks were sufficient.  As soon as larger numbers were necessary to conduct transactions, a system was needed to represent them.  These systems involved grouping, with symbols  to mark the…

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A Review of Math Fundamentals: Operations with Decimals 150 150 Deborah

A Review of Math Fundamentals: Operations with Decimals

Overview:  What Are Decimals? The word decimal has a Latin root that means “10”.  Any number written in base 10 (which is the numerical base that we generally use) is already expressed in a decimal value.  The digits to the left of the decimal point are increasing powers of 10, and to the right of…

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Let’s Do Some Math Review of Measurement Systems 150 150 Deborah

Let’s Do Some Math Review of Measurement Systems

Overview:  Why Measurement? The earliest systems of measurement used natural phenomena such as the rotation of the earth (day), phases of the moon (month), and the seasons of the year.  Units of measurement soon became standardized, often to the measurements of the king.  For example, King  Henry I decreed that the yard was the distance…

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A Review of Math Fundamentals: Factors and Multiples 150 150 Deborah

A Review of Math Fundamentals: Factors and Multiples

Overview:  Primes and Composites The definition of a prime number is any whole number greater than 1 that has only itself and 1 as factors.  For example, the number 23 has only itself and 23 as factors that divide it evenly without a remainder.  A composite number is any number greater than 1 that has…

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Biology Review of Genetics and Probability 150 150 Deborah

Biology Review of Genetics and Probability

Overview:  Chance and Probability Geneticists use the principles of chance  and probability to express the results of genetic experiments with pea plants, as well as other plants and animals.  In mathematical terms, probability refers to the fraction (or percentage, in decimals) of times an event can occur.  According to the product rule for independent events.…

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Proofreading for Errors in Capitalization, Spelling, and Punctuation 171 295 School Tutoring

Proofreading for Errors in Capitalization, Spelling, and Punctuation

Overview:  What Are Mechanical Errors? Although many proofreading questions on the English portion of the SAT and ACT are to catch errors in standard English usage, some questions involve errors in capitalization, spelling, and punctuation.  These types of mechanical errors are also common in everyday writing, such as classroom and test essays.  While many spelling…

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Math Basics: A Review of Division 150 150 Deborah

Math Basics: A Review of Division

Overview:  What Is Division? Division is the inverse of multiplication.  For example, 20/5 =4, because 4 X 5 = 20.  Expressed in terms of a mathematical definition, for any whole number s, when s does not equal zero, r/s = z only if r = s X z.  The number that is the answer is…

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