3/5/15

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191 192

3/5/15Connection/Application/Exit

Baby Alien Activity

Introduction to Genetics Introduction to Genetics

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Practice:

Glue Notes Here.

March 5, 2015

AGENDA

 

1. Starter2. Notes3. Activity

2/17 Classification 175-1762/18 Classification Mini lab 177-178

2/20 Classification Characteristics Notes 179-1802/23 Classification Booklet 181-1822/24 Dichotomous Keys Notes 183-1842/25 Dichotomous Keys Activity 185-1862/27 Constructing a Dichotomous key 187-1883/3 CBA Review 189-1903/5 Introduction to genetics 191-192

Table of Contents

Introduction to Genetics

TEKS 7.14A define heredity as the passage of genetic instructions from one generation to the next

TEKS 7.14C recognize that inherited traits of individuals are governed in the genetic material found in the genes within chromosomes in the nucleus

Gregor Mendel is often called the “Father of Genetics”.

He identified dominant & recessive traits by studying the heredity of pea plants.

The process in which characteristics or traits are passed from parents to offspring is called heredity.

The scientific study of heredity, or how genes are passed to offspring, is called genetics.

Traits are an organism’s physical characteristics (phenotype), like nose shape, eye color, blood type or eyelash length.

These traits are controlled by genes that are passed to us from our parents.

Human cells contain rod-shaped structures called chromosomes.

Chromosomes are found in the nucleus of a cell & are made up of strands of DNA (deoxyribonucleic acid).

DNA is made up of genes that carry the genetic information that controls our traits.

Chromosomes exist in pairs, each chromosome having the same genes; therefore genes also exist in pairs (genotype).

Offspring receive one set from the

mother & one from the father.

Each offspring will receive a different combination of genes from its parents.

Sexual reproduction results in more diversity due to the large number of gene combinations that may occur.

Each member of a gene pair is called an allele.

Alleles are different forms of the same gene, for example on allele may be for dimples & the other for no dimples.

Alleles may be

dominant or

recessive.

A dominant allele is a strong form of a gene whose traits always show up in the organism.

The recessive allele on the other hand is a weak form of a gene that can be hidden or covered up if the dominant allele is present.

 

3/5/15

Starter:

191 192

3/5/15Connection/Application/Exit

Baby Alien Activity

Introduction to Genetics Introduction to Genetics

Glue Starter Here.

Practice:

Glue Notes Here.