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Dihybrid Crosses Unit 4 – Lecture 6

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**Dihybrid Cross a 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]

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**Solving a Dihybrid Determine the genotypes of each parent**

Given to you, or you have to solve for them Given: Parent #1 AABB Given: Parent #2 aabb

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Solving a Dihybrid Create your dihybrid cross [4x4]

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**Solving a Dihybrid Determine Gametes:**

pair first allele of first trait with first allele of second trait A A B B first gamete = AB

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**Solving a Dihybrid Determine Gametes:**

pair first allele of first trait with second allele of second trait A A B B second gamete = AB

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**Solving a Dihybrid Determine Gametes:**

pair second allele of first trait with first allele of second trait A A B B third gamete = AB

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**Solving a Dihybrid Determine Gametes:**

pair second allele of first trait with second allele of second trait A A B B fourth gamete = AB

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**Solving a Dihybrid Determine Gametes:**

pair first allele of first trait with first allele of second trait a a b b first gamete = ab

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**Solving a Dihybrid Determine Gametes:**

pair first allele of first trait with second allele of second trait a a b b second gamete = ab

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**Solving a Dihybrid Determine Gametes:**

pair second allele of first trait with first allele of second trait a a b b third gamete = ab

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**Solving a Dihybrid Determine Gametes:**

pair second allele of first trait with second allele of second trait a a b b fourth gamete = ab

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Solving a Dihybrid Label cross w/ parent gametes above / to left AB ab

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**Solving a Dihybrid Fill in boxes:**

fill DOWN each column w/ whatever’s there AB ab AB ab A B

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**Solving a Dihybrid Fill in boxes:**

fill ACROSS each column with whatever’s there AB ab A B AB ab AaBb

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**Solving a Dihybrid Determine Genotype Ratios**

record all genotypes you have count and record number of each genotype AaBb: 16/16 [or 100%] AB ab AaBb

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**Solving a Dihybrid Determine Phenotype Ratios**

count how many of each phenotype you have record # of phenotypes represented purple, round: 16/16 [or 100%] AB ab AaBb

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**Solving a Dihybrid #2 Determine 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 QqRr Given: Parent #2 QqRr

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Solving a Dihybrid Create your dihybrid cross [4x4]

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**Solving a Dihybrid Determine Gametes:**

pair first allele of first trait with first allele of second trait Q q R r first gamete = QR

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**Solving a Dihybrid Determine Gametes:**

pair first allele of first trait with second allele of second trait Q q R r second gamete = Qr

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**Solving a Dihybrid Determine Gametes:**

pair second allele of first trait with first allele of second trait Q q R r third gamete = qR

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**Solving a Dihybrid Determine Gametes:**

pair second allele of first trait with second allele of second trait Q q R r fourth gamete = qr

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**Solving a Dihybrid Label cross w/ parent gametes above / to left QR Qr**

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**Solving a Dihybrid Fill in boxes: Q R Q r q r**

fill DOWN each column w/ whatever’s there QR Qr qR qr Q R Q r q r

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**Solving a Dihybrid Fill in boxes: QQRR QQRr QqRR QqRr QQrr Qqrr qqRR**

fill ACROSS each column with whatever’s there QR Qr qR qr QQRR QQRr QqRR QqRr QQrr Qqrr qqRR qqRr qqrr QR Qr qR qr Q R Q r q r

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**Solving a Dihybrid Determine Genotype Ratios**

record all genotypes you have count and record number of each genotype [not going to make you do it for this one.. just know how to] QR Qr qR qr QQRR QQRr QqRR QqRr QQrr Qqrr qqRR qqRr qqrr

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**Solving a Dihybrid Determine Phenotype Ratios**

count how many of each phenotype you have record # of phenotypes represented 9/16 - purple, round 3/16 - purple, wrinkled 3/16 - white, round 1/16 - white, wrinkled QR Qr qR qr QQRR QQRr QqRR QqRr QQrr Qqrr qqRR qqRr qqrr

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Dihybrid Cross Notes. 1. Determine dominant and recessive traits Carefully read the problem.

Dihybrid Cross Notes. 1. Determine dominant and recessive traits Carefully read the problem.

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