Dihybrid Crosses
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Transcript of Dihybrid Crosses
![Page 1: Dihybrid Crosses](https://reader038.fdocuments.us/reader038/viewer/2022110101/56812bc7550346895d90126c/html5/thumbnails/1.jpg)
Unit 4 – Lecture 6
![Page 2: Dihybrid Crosses](https://reader038.fdocuments.us/reader038/viewer/2022110101/56812bc7550346895d90126c/html5/thumbnails/2.jpg)
Dihybrid Crossa 4x4 representation of crossing TWO traits
monohybrid = 1 trait w/ 2 alleles= 1 allele gamete each for 2x2 box
dihybrid = 2 traits w/ 2 alleles EACH = 4 alleles
= 2 allele gametes each for 4x4 box[one allele for each trait in each
gamete]
![Page 3: Dihybrid Crosses](https://reader038.fdocuments.us/reader038/viewer/2022110101/56812bc7550346895d90126c/html5/thumbnails/3.jpg)
Solving a DihybridDetermine the genotypes of each parent
Given to you, or you have to solve for them
Given: Parent #1 AABBGiven: Parent #2 aabb
![Page 4: Dihybrid Crosses](https://reader038.fdocuments.us/reader038/viewer/2022110101/56812bc7550346895d90126c/html5/thumbnails/4.jpg)
Solving a DihybridCreate your dihybrid cross [4x4]
![Page 5: Dihybrid Crosses](https://reader038.fdocuments.us/reader038/viewer/2022110101/56812bc7550346895d90126c/html5/thumbnails/5.jpg)
Solving a DihybridDetermine Gametes:
pair first allele of first trait with first allele of second trait
A A B B
first gamete = AB
![Page 6: Dihybrid Crosses](https://reader038.fdocuments.us/reader038/viewer/2022110101/56812bc7550346895d90126c/html5/thumbnails/6.jpg)
Solving a DihybridDetermine Gametes:
pair first allele of first trait with second allele of second trait
A A B B
second gamete = AB
![Page 7: Dihybrid Crosses](https://reader038.fdocuments.us/reader038/viewer/2022110101/56812bc7550346895d90126c/html5/thumbnails/7.jpg)
Solving a DihybridDetermine Gametes:
pair second allele of first trait with first allele of second trait
A A B B
third gamete = AB
![Page 8: Dihybrid Crosses](https://reader038.fdocuments.us/reader038/viewer/2022110101/56812bc7550346895d90126c/html5/thumbnails/8.jpg)
Solving a DihybridDetermine Gametes:
pair second allele of first trait with second allele of second trait
A A B B
fourth gamete = AB
![Page 9: Dihybrid Crosses](https://reader038.fdocuments.us/reader038/viewer/2022110101/56812bc7550346895d90126c/html5/thumbnails/9.jpg)
Solving a DihybridDetermine Gametes:
pair first allele of first trait with first allele of second trait
a a b b
first gamete = ab
![Page 10: Dihybrid Crosses](https://reader038.fdocuments.us/reader038/viewer/2022110101/56812bc7550346895d90126c/html5/thumbnails/10.jpg)
Solving a DihybridDetermine Gametes:
pair first allele of first trait with second allele of second trait
a a b b
second gamete = ab
![Page 11: Dihybrid Crosses](https://reader038.fdocuments.us/reader038/viewer/2022110101/56812bc7550346895d90126c/html5/thumbnails/11.jpg)
Solving a DihybridDetermine Gametes:
pair second allele of first trait with first allele of second trait
a a b b
third gamete = ab
![Page 12: Dihybrid Crosses](https://reader038.fdocuments.us/reader038/viewer/2022110101/56812bc7550346895d90126c/html5/thumbnails/12.jpg)
Solving a DihybridDetermine Gametes:
pair second allele of first trait with second allele of second trait
a a b b
fourth gamete = ab
![Page 13: Dihybrid Crosses](https://reader038.fdocuments.us/reader038/viewer/2022110101/56812bc7550346895d90126c/html5/thumbnails/13.jpg)
Solving a DihybridLabel cross w/ parent gametes above / to left
AB AB AB AB
ab
ab
ab
ab
![Page 14: Dihybrid Crosses](https://reader038.fdocuments.us/reader038/viewer/2022110101/56812bc7550346895d90126c/html5/thumbnails/14.jpg)
Solving a DihybridFill in boxes:
fill DOWN each column w/ whatever’s there
AB AB AB AB
ab A B A B A B A B
ab A B A B A B A B
ab A B A B A B A B
ab A B A B A B A B
AB AB AB AB
ab
ab
ab
ab
![Page 15: Dihybrid Crosses](https://reader038.fdocuments.us/reader038/viewer/2022110101/56812bc7550346895d90126c/html5/thumbnails/15.jpg)
Solving a DihybridFill in boxes:
fill ACROSS each column with whatever’s there
AB AB AB AB
ab AaBb AaBb AaBb AaBb
ab AaBb AaBb AaBb AaBb
ab AaBb AaBb AaBb AaBb
ab AaBb AaBb AaBb AaBb
AB AB AB AB
ab A B A B A B A B
ab A B A B A B A B
ab A B A B A B A B
ab A B A B A B A B
![Page 16: Dihybrid Crosses](https://reader038.fdocuments.us/reader038/viewer/2022110101/56812bc7550346895d90126c/html5/thumbnails/16.jpg)
Solving a DihybridDetermine Genotype Ratios
record all genotypes you havecount and record number of each genotype
AaBb: 16/16[or 100%]
AB AB AB AB
ab AaBb AaBb AaBb AaBb
ab AaBb AaBb AaBb AaBb
ab AaBb AaBb AaBb AaBb
ab AaBb AaBb AaBb AaBb
![Page 17: Dihybrid Crosses](https://reader038.fdocuments.us/reader038/viewer/2022110101/56812bc7550346895d90126c/html5/thumbnails/17.jpg)
Solving a DihybridDetermine Phenotype Ratios
count how many of each phenotype you have
record # of phenotypes represented
purple, round: 16/16[or 100%]
AB AB AB AB
ab AaBb AaBb AaBb AaBb
ab AaBb AaBb AaBb AaBb
ab AaBb AaBb AaBb AaBb
ab AaBb AaBb AaBb AaBb
![Page 18: Dihybrid Crosses](https://reader038.fdocuments.us/reader038/viewer/2022110101/56812bc7550346895d90126c/html5/thumbnails/18.jpg)
Solving a Dihybrid #2Determine the genotypes of each parent
Given to you, or you have to solve for them
Given – both parents are heterozygous for both traits.
Given: Parent #1 QqRrGiven: Parent #2 QqRr
![Page 19: Dihybrid Crosses](https://reader038.fdocuments.us/reader038/viewer/2022110101/56812bc7550346895d90126c/html5/thumbnails/19.jpg)
Solving a DihybridCreate your dihybrid cross [4x4]
![Page 20: Dihybrid Crosses](https://reader038.fdocuments.us/reader038/viewer/2022110101/56812bc7550346895d90126c/html5/thumbnails/20.jpg)
Solving a DihybridDetermine Gametes:
pair first allele of first trait with first allele of second trait
Q q R r
first gamete = QR
![Page 21: Dihybrid Crosses](https://reader038.fdocuments.us/reader038/viewer/2022110101/56812bc7550346895d90126c/html5/thumbnails/21.jpg)
Solving a DihybridDetermine Gametes:
pair first allele of first trait with second allele of second trait
Q q R r
second gamete = Qr
![Page 22: Dihybrid Crosses](https://reader038.fdocuments.us/reader038/viewer/2022110101/56812bc7550346895d90126c/html5/thumbnails/22.jpg)
Solving a DihybridDetermine Gametes:
pair second allele of first trait with first allele of second trait
Q q R r
third gamete = qR
![Page 23: Dihybrid Crosses](https://reader038.fdocuments.us/reader038/viewer/2022110101/56812bc7550346895d90126c/html5/thumbnails/23.jpg)
Solving a DihybridDetermine Gametes:
pair second allele of first trait with second allele of second trait
Q q R r
fourth gamete = qr
![Page 24: Dihybrid Crosses](https://reader038.fdocuments.us/reader038/viewer/2022110101/56812bc7550346895d90126c/html5/thumbnails/24.jpg)
Solving a DihybridLabel cross w/ parent gametes above / to left
QR Qr qR qr
QR
Qr
qR
qr
![Page 25: Dihybrid Crosses](https://reader038.fdocuments.us/reader038/viewer/2022110101/56812bc7550346895d90126c/html5/thumbnails/25.jpg)
Solving a DihybridFill in boxes:
fill DOWN each column w/ whatever’s there
QR Qr qR qr
QR Q R Q r qR q r
Qr Q R Q r qR q r
qR Q R Q r qR q r
qr Q R Q r qR q r
![Page 26: Dihybrid Crosses](https://reader038.fdocuments.us/reader038/viewer/2022110101/56812bc7550346895d90126c/html5/thumbnails/26.jpg)
Solving a DihybridFill in boxes:
fill ACROSS each column with whatever’s there
QR Qr qR qr
QR Q R Q r qR q r
Qr Q R Q r qR q r
qR Q R Q r qR q r
qr Q R Q r qR q r
QR Qr qR qr
QR QQRR QQRr QqRR QqRr
Qr QQRr QQrr QqRr Qqrr
qR QqRR QqRr qqRR qqRr
qr QqRr Qqrr qqRr qqrr
![Page 27: Dihybrid Crosses](https://reader038.fdocuments.us/reader038/viewer/2022110101/56812bc7550346895d90126c/html5/thumbnails/27.jpg)
Solving a DihybridDetermine Genotype Ratios
record all genotypes you havecount and record number of each genotype
[not going to make you do it for this one..just know how to]
QR Qr qR qr
QR QQRR QQRr QqRR QqRr
Qr QQRr QQrr QqRr Qqrr
qR QqRR QqRr qqRR qqRr
qr QqRr Qqrr qqRr qqrr
![Page 28: Dihybrid Crosses](https://reader038.fdocuments.us/reader038/viewer/2022110101/56812bc7550346895d90126c/html5/thumbnails/28.jpg)
Solving a DihybridDetermine Phenotype Ratios
count how many of each phenotype you have
record # of phenotypes represented
9/16 - purple, round3/16 - purple, wrinkled3/16 - white, round1/16 - white, wrinkled
QR Qr qR qr
QR QQRR QQRr QqRR QqRr
Qr QQRr QQrr QqRr Qqrr
qR QqRR QqRr qqRR qqRr
qr QqRr Qqrr qqRr qqrr