Inquiry 11/19 and 11/20 Please put your test corrections and test in the inbox (even if you didn’t...
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Transcript of Inquiry 11/19 and 11/20 Please put your test corrections and test in the inbox (even if you didn’t...
![Page 1: Inquiry 11/19 and 11/20 Please put your test corrections and test in the inbox (even if you didn’t finish) No warm-up! Flip to section 3 of your lab book.](https://reader036.fdocuments.net/reader036/viewer/2022081516/5697bfd41a28abf838cacb5e/html5/thumbnails/1.jpg)
Inquiry 11/19 and 11/20
• Please put your test corrections and test in the inbox (even if you didn’t finish)
• No warm-up! Flip to section 3 of your lab book
![Page 2: Inquiry 11/19 and 11/20 Please put your test corrections and test in the inbox (even if you didn’t finish) No warm-up! Flip to section 3 of your lab book.](https://reader036.fdocuments.net/reader036/viewer/2022081516/5697bfd41a28abf838cacb5e/html5/thumbnails/2.jpg)
Learning Targets
I can correctly write the genotype and phenotype of an organism.
I can analyze and explain the results of dominant and recessive yeast traits.
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Class Genetics Study(Leave room for a 4-5 sentence yeast lab conclusion)
Record your results as we go through the trials:Taster or non-tasterRoller or non-rollerAttached earlobes or free-hangingHitchhiker's thumb or notL over R or R over LMid-digital hair or noneRight or leftFreckles or none
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Class Genetics StudyRecord Class Data
Taster or non-tasterRoller or non-rollerAttached earlobes or free-hangingHitchhiker's thumb or notL over R or R over LMid-digital hair or noneRight or leftFreckles or none
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Class Genetics Study
1. Which traits that we studied are dominant?
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Intro. to Genetics
How do the genes you
inherit make you “you”?
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History of Genetics
Gregor Mendel 1822-1884 “Father of genetics” Austrian monk who studied inheritance
of physical traits in pea plants
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Pea plants reproduce sexually- with male and female gametes Gametes = sperm (pollen) and eggs
Peas can self-pollinate and be true-breeding True-breeding: short plants breed short
plants and tall plants breed tall plants.
Mendel’s Pea Plant Study
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Mendel’s Pea Plant Study
Mendel studied these traits
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Mendel’s Crosses
Mendel bred plants with different traits and studied the offspring. original parents are
the P generation. offspring are the F1
(daughter/son) generation
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Mendel’s Findings When crossing
parent plants (P) with different traits, all F1 plants looked the same!
When crossing F1 plants, three out of four offspring looked like the parents!
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2 of Mendel’s Laws
Law of Inheritance Traits are controlled by pairs of genes-
with one gene coming from each parent These genes are called alleles
Law of Dominance some alleles are dominant and other
are recessive. Dominant – physically expressed Recessive – present but not expressed
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Key Terms
Gene Sections of DNA within chromosomes Are the units of heredity
Allele Alternative genes for trait Example: Height (Tall or Short); Eyes
(Brown or Blue); Cheeks (Dimple or No Dimple); Hair Line (Peak or Straight)
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Dominant vs. Recessive
Each gene has two possible alleles Dominant- always expressed Recessive- always hidden by a dominant
allele. Example: Dimpled chin (cleft chin) is
dominant D= dimpled d= non-dimpled Your two copies canbe DD, Dd, or dd
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Dominant vs. Recessive
Genotype= the alleles that you have for a trait
Phenotype= the physical expression of those alleles
A person with a dimpled chin can have the genotype DD or Dd
A person with a non-dimpled chin can only have the genotype dd
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More Definitions
Homozygous= two of same allele (DD or dd)
Heterozygous= two different alleles(Dd- also called hybrid)
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Back to Class Genetics
Answer the rest of the questions from the worksheet IN YOUR LAB BOOK.
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Yeast Lab
1. Briefly record under your prediction grid why you chose each color for each “baby”
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Yeast Lab Results/Conclusion
Record the color of each offspring in each box.
Conclusion Claim- which color is dominant? Evidence- how do you know? Reasoning- why does being dominant or
recessive result in that color pattern?
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Punnett Squares Knowing genotypes of parents, we can
predict the probability of offspring having dominant/recessive traits
R R
R RR RR
r Rr Rr
Results:
Genotypes:
50% RR; 50% Rr
Phenotypes:
100% round
Ex: Peas
Round seeds = R
Wrinkled seeds = r
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Simple Punnett Self Test
In the Griffin Family, round heads are dominant to football shaped heads. Cross a parent who is homozygous dominant with one who is heterozygous. Show the genotypic and phenotypic ratios.
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Mendel’s Laws Law of Segregation
During gamete formation two chromosomes separate
Each gamete contains oneallele for each trait
Law of Independent Assortment Traits are inherited independently of
each other