1. Title: Biology 2/2/07 Objectives: Class Topics
7/27/2019
Title: Biology 2/2/07
Objectives:
To continue learning about Mendelian genetics and learn about some of the aberrations to Mendelian genetics
Class Topics
Hand in Genetics Problems Worksheet before the bell rings please
Review Chapter 8 Quiz 1
Chapter 8 – Beyond Mendel
Review Dihybrid crosses
Chapter 8 Quiz 2 Preview
Probability
Test Crosses
Pedigree
“The man who does not read good books has no advantage over the man who cannot read them.”
Mark Twain
Saturday, July 27, :41 PM

2. Class Assignments Genetics Problems 2/2/07 Read 170-178 2/2/07
7/27/2019
Class Assignments
What
By When
Genetics Problems 2/2/07
Read /2/07
Chapter 8 Quiz 2 2/6/07
W.S. Probability and dihybrid crosses 2/6/07
Due this class period
Due next class period
Due in the future

3. 7/27/2019
Grade Sheet
2A – p. 157 (5 pts.)

4. 7/27/2019
Dihybrid Cross
GgTt x GgTt

5. 7/27/2019
Results
F1 - Pheno
Green/Tall
Green/short
yellow/Tall
yellow/short
What if there were 961 of these seeds planted? Approximately, how many of each type would there be?

6. Probability Likelihood that an event will occur
7/27/2019
Probability
Likelihood that an event will occur
Expressed as a fraction, ratio, decimal, or percentage (we’ll use fractions)
Probability of a coin landing as “heads”?
1:1, ½, 0.50, 50%
Probability a heterozygote will produce a dominant allele in its gamete?

7. Probability Product rule Toss a coin – probability of “tails”?
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Probability
Product rule
Toss a coin – probability of “tails”?
Toss the same coin again – probability of “tails”?
Probability of 2 “tails”
½ x ½ = ¼

8. Probability Male Female
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Probability
Male
1/2
Female
Family with having a boy, a girl, a boy, and a girl in that order.

9. Test Cross Used when there’s an unknown genotype of dominant phenotype
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Test Cross
Used when there’s an unknown genotype of dominant phenotype
Crossed with a homozygous recessive
Recessive phenotype
If offspring are all dominant?
If offspring are ½ dominant and ½ recessive

10. 7/27/2019
Test Cross problem
Determine the genotype of a pea plant with yellow seeds if the test cross offspring all have yellow seeds
P ___ x ___ F1
Pheno
Geno
What if the F1 had ½ yellow and ½ green seeds?

11. Chapter 8 Quiz 2 Review Codominance cross Incomplete dominance cross
7/27/2019
Chapter 8 Quiz 2 Review
Codominance cross
F1 and F2 generations
Incomplete dominance cross
F1 only
Mendel’s numbers – ratios – pod color
Dihybrid cross 1
F1 and extrapolate data for more seeds
Dihybrid cross 2
F1 and F2 generations and extrapolate data for more seeds

12. Pedigree Analysis Hemophilia
7/27/2019
Males = Square
Females = Circles
Each generation is a line
Vertical lines connect parents and children
Horizontal lines connect siblings
Left to right in order with age.
Pedigree Analysis Hemophilia

13. Pedigree Analysis Seen in every generation Skips generations 7/27/2019
From:

14. 7/27/2019

15. From: http://www.people.virginia.edu/~rjh9u/brachyped.html
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From:

16. 7/27/2019
Hapsburg Lip and Jaw