Download Lesson 16.1 Genes and Variation

Lesson 16.1 Genes and Variation
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Warm up activity: Ch 15 interactive self-test PHSchool.com web code cba-5150
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Vocabulary:
Gene pool: combined genetic information of ____________________________________________
__________________________________________________________________________
Relative frequency: Number of times an allele occurs in a gene pool compared with ______________
_____________________________________________________________________________
Polygenic trait: trait controlled ___________________________________________________________
Lecture notes 16.1
What Darwin didn’t know
How traits pass from _________________________________________
( traits are genes, sections of ___________________________________
How variation in a ___________________________________________
(through mutations __________________________________________)
How common is genetic
Some genes have 2 alleles, others ______________________________
variation?
Some traits are a blend of several _______________________________
___________________________________________________________
Gene pool
The combined genetic information of ____________________________
___________________________________________________________
Gene frequency
Gene frequency is how often ___________________________________
___________________________________________________________
Gene pool and allele
The allele frequency (B:b) is about equal, even though _____________
Frequency
__________________________________________________________
2 sources of genetic
1. Mutations to DNA: any change _______________________________
variation
___________________________________________________________
2. Gene shuffling:
a) Independent assortment ____________________________________
b)Crossing over ___________________________________________
c) Random fertilization (through sexual __________________________
___________________________________________________________
___________________________________________________________
Single gene traits
A single gene trait is controlled by 1 gene that has 2 ________________
___________________________________________________________
Other examples: tongue ______________________________________
Polygenic traits
Traits controlled by 2 or more __________. Ex: ____________________
Variations show many ________________________________________
A ____________________________________curve is typical of
___________________________________________________________
It’s also called _______________________________________________
For any group, some will be _____________some _________________
Most are ___________________height.
Review questions:
1. How are traits passed from one generation to the next? _____________________________________
_____________________________________________________________________________________
2. How does variation arise in a population? _________________________________________________
3. In what ways are all living things similar? _________________________________________________
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