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Unit 4 – Lecture 6. Dihybrid Cross a 4x4 representation of crossing TWO traits monohybrid = 1 trait w/ 2 alleles = 1 allele gamete each for 2x2 box dihybrid.

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Presentation on theme: "Unit 4 – Lecture 6. Dihybrid Cross a 4x4 representation of crossing TWO traits monohybrid = 1 trait w/ 2 alleles = 1 allele gamete each for 2x2 box dihybrid."— Presentation transcript:

1 Unit 4 – Lecture 6

2 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]

3 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

4 Solving a Dihybrid Create your dihybrid cross [4x4]

5 Solving a Dihybrid Determine Gametes: pair first allele of first trait with first allele of second trait A A B B first gamete = AB

6 Solving a Dihybrid Determine Gametes: pair first allele of first trait with second allele of second trait A A B B second gamete = AB

7 Solving a Dihybrid Determine Gametes: pair second allele of first trait with first allele of second trait A A B B third gamete = AB

8 Solving a Dihybrid Determine Gametes: pair second allele of first trait with second allele of second trait A A B B fourth gamete = AB

9 Solving a Dihybrid Determine Gametes: pair first allele of first trait with first allele of second trait a a b b first gamete = ab

10 Solving a Dihybrid Determine Gametes: pair first allele of first trait with second allele of second trait a a b b second gamete = ab

11 Solving a Dihybrid Determine Gametes: pair second allele of first trait with first allele of second trait a a b b third gamete = ab

12 Solving a Dihybrid Determine Gametes: pair second allele of first trait with second allele of second trait a a b b fourth gamete = ab

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

14 Solving a Dihybrid Fill in boxes: fill DOWN each column w/ whatevers there AB ab A B ab A B ab A B ab A B ab

15 Solving a Dihybrid Fill in boxes: fill ACROSS each column with whatevers there AB ab AaBb ab AaBb ab AaBb ab AaBb AB ab A B ab A B ab A B ab A B

16 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 ab AaBb ab AaBb ab AaBb

17 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 ab AaBb ab AaBb ab AaBb

18 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

19 Solving a Dihybrid Create your dihybrid cross [4x4]

20 Solving a Dihybrid Determine Gametes: pair first allele of first trait with first allele of second trait Q q R r first gamete = QR

21 Solving a Dihybrid Determine Gametes: pair first allele of first trait with second allele of second trait Q q R r second gamete = Qr

22 Solving a Dihybrid Determine Gametes: pair second allele of first trait with first allele of second trait Q q R r third gamete = qR

23 Solving a Dihybrid Determine Gametes: pair second allele of first trait with second allele of second trait Q q R r fourth gamete = qr

24 Solving a Dihybrid Label cross w/ parent gametes above / to left QRQrqRqr QR Qr qR qr

25 Solving a Dihybrid Fill in boxes: fill DOWN each column w/ whatevers there QRQrqRqr QR Q rqRq r Qr Q RQ rqRq r qR Q RQ rqRq r Q RQ rqRq r

26 Solving a Dihybrid Fill in boxes: fill ACROSS each column with whatevers there QRQrqRqr QR Q rqRq r Qr Q RQ rqRq r qR Q RQ rqRq r Q RQ rqRq r QRQrqRqr QR QQRRQQRrQqRRQqRr Qr QQRrQQrrQqRrQqrr qR QqRRQqRrqqRRqqRr qr QqRrQqrrqqRrqqrr

27 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] QRQrqRqr QR QQRRQQRrQqRRQqRr Qr QQRrQQrrQqRrQqrr qR QqRRQqRrqqRRqqRr qr QqRrQqrrqqRrqqrr

28 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 QRQrqRqr QR QQRRQQRrQqRRQqRr Qr QQRrQQrrQqRrQqrr qR QqRRQqRrqqRRqqRr qr QqRrQqrrqqRrqqrr


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