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Genetics Notes 1024.notebook 1 What 2 traits do you have in common with your parents? Warm up # 47 10/24/2014 Assignment Date 22. Observation activity 10/23/2014 23. Genetics notes 2 10/24/2014 Genetics Notes Genetics: the study of how traits are passed from parent to offspring.

Genetics Notes 1024.notebook€¦ · Genetics Notes 1024.notebook 5 Gregor Mendel Gregor Mendel was the first person known to record evidence that traits of organisms are determined

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Page 1: Genetics Notes 1024.notebook€¦ · Genetics Notes 1024.notebook 5 Gregor Mendel Gregor Mendel was the first person known to record evidence that traits of organisms are determined

Genetics Notes 1024.notebook

1

What 2 traits do you have in common with your parents?

Warm up # 4710/24/2014

Assignment                          Date

22. Observation activity           10/23/2014

23. Genetics notes 2               10/24/2014

Genetics Notes Genetics: the study of how traits are passed from parent to offspring.

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What do you think genes are?

GenesA section of DNA that has information about a specific trait of an organism

Bill Nye Genes (9:00 ­ 10:30)

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Bill Nye Library Analogy

Library = ________

Books = _________

Chapters = _________

1. Traits2. Heredity3. Alleles4. Genotype5. Phenotype6. Recessive Traits7. Dominant Genes. 

What is a trait?

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What is a trait?A trait is a genetically determined 

characteristic 

What is Heredity?

What is Heredity?The passing on of characteristics  genetically 

from one generation to another. 

Brain Pop Heredity

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Gregor Mendel ­ Gregor Mendel was the first person known to record evidence that traits of organisms are determined by factors passed from parents to offspring.­ Born in 1822 in Europe­ Father of Genetics

Mendel studied genetics by conducting breeding experiments with pea plants.

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TED Video

Dominant Traits

Dominant TraitsThe stronger trait, the trait that will be expressed.

Recessive Traits

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Recessive TraitsThe weaker trait, will not be expressed if a dominant trait is present.

Allele

Allele2 alleles make up a gene

Every gene has 2 alleles

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PhenotypeThe visible traits and characteristics of an organism

GenotypeThe alleles of all the genes on an organism's chromosomes

Uppercase letters represent dominant alleles

Lowercase letters represent recessive alleles

EeAlleles for eye color

Allele for brown eyes (dominant) Allele for blue eyes (recessive)

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Homo means the same

Hetero means different

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Homozygous: two alleles have the same information

Heterozygous: two alleles have different information

The genotype contains 2 alleles, one from mom and one from dad. These alleles can be either dominant or recessive. If there are one or more dominant alleles present, then the phenotype will be representative of the dominant. If there are no dominant alleles present, then the phenotype will take on the recessive feature. The combination of genotype alleles determine the phenotype

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Brain pop: Heredity

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In seals, the gene for the length of whiskers has two alleles. The dominant allele (W) codes for long whiskers and the recessive allele (w) codes for short whiskers. 

What is the probability of producing offspring  that have short whiskers from two long­whiskered seals? One seal is homozygous dominant and the other is heterozygous.

________% long whiskers

________% short whiskers

Tongue­rolling is a dominant trait (R). Mr. Saephanh can roll his tongue, but his sister, May, cannot. 

1. What alleles must May have? ___________________________

2. What possible alleles can Mr. Saephanh have _______________

3. In order to show recessive traits, a living thing must have 2 (RR 

or rr)? _____________________________________________________.

ReflectionWhat is something new that you learned 

about genetics that you did not know before?

(1 paragraph responses)