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Examination of Heritable Traits in Dihybrid-crossed Corn Dihybrid Cross: P1 cross = BBFF x bbff. F2 generation is corn in picture. Because you are not in lab, we have counted the corn kernels for you. Blue corn is dominant over yellow. Full kernel is dominant over shrunken kernel. This photo of an ear of "corncob C" illustrates the F2 generation from a dihybrid cross, showing the four different genes and grain types. In the photo, there are four grain phenotypes in the ear of genetic corn: Blue & Full (A), Blue & shrunken (B), yellow & Full (C) and yellow & shrunken (D). These four grain phenotypes are produced by the two pairs of heterozygous genes (B & b and F & f) located on two pairs of homologous chromosomes, each gene on a separate chromosome. The Law of Independent Assortment is easily demonstrated using an F2 cross (second generation using F1 X F1) in which the original parents P1 used for making the F1s differed in two traits. Determine possible gametes: F first O outer I inner L last OR 13 14 23 24 13. Draw a Punnett square for the P1x P1 cross. P1: BBFF x P1: bbff BF BF BF BF bf BbFf BbFf BbFf BbFf bf BbFf BbFf BbFf BbFf bf BbFf bf Draw a Punnett square for F1xF1 cross. F1: x F1: 14. From your F1xF1 Punnett square cross, examine the F2 generation. 1) List the F1 gametes 2) List the F2 genotypes 3) List the F2 phenotypes __

          Examination of Heritable Traits in Dihybrid-crossed Corn

Dihybrid Cross: P1 cross = BBFF x bbff. F2 generation is corn in picture.
Because you are not in lab, we have counted the corn kernels for you.
Blue corn is dominant over yellow. Full kernel is dominant over shrunken kernel.

This photo of an ear of "corncob C" illustrates the F2 generation from a dihybrid cross, showing the four different genes and grain types. In the photo, there are four grain phenotypes in the ear of genetic corn: Blue & Full (A), Blue & shrunken (B), yellow & Full (C) and yellow & shrunken (D).

These four grain phenotypes are produced by the two pairs of heterozygous genes (B & b and F & f) located on two pairs of homologous chromosomes, each gene on a separate chromosome. The Law of Independent Assortment is easily demonstrated using an F2 cross (second generation using F1 X F1) in which the original parents P1 used for making the F1s differed in two traits.

Determine possible gametes:
F first
O outer
I inner
L last
OR
13 14 23 24

13. Draw a Punnett square for the P1x P1 cross. 
P1: BBFF x P1: bbff
BF BF BF BF
bf BbFf BbFf BbFf BbFf
bf BbFf BbFf BbFf BbFf
bf BbFf
bf

Draw a Punnett square for F1xF1 cross.
F1: ______ x F1: ______

14. From your F1xF1 Punnett square cross, examine the F2 generation.
1) List the F1 gametes ______
2) List the F2 genotypes ______
3) List the F2 phenotypes ______

Examination of Heritable Traits in Dihybrid-crossed Corn

Dihybrid Cross: P1 cross = BBFF x bbff. F2 generation is corn in picture.
Because you are not in lab, we have counted the corn kernels for you.
Blue corn is dominant over yellow. Full kernel is dominant over shrunken kernel.

This photo of an ear of "corncob C" illustrates the F2 generation from a dihybrid cross, showing the four different genes and grain types. In the photo, there are four grain phenotypes in the ear of genetic corn: Blue Full (A), Blue shrunken (B), yellow Full (C) and yellow shrunken (D).

These four grain phenotypes are produced by the two pairs of heterozygous genes (B b and F f) located on two pairs of homologous chromosomes, each gene on a separate chromosome. The Law of Independent Assortment is easily demonstrated using an F2 cross (second generation using F1 X F1) in which the original parents P1 used for making the F1s differed in two traits.

Determine possible gametes:
F first
O outer
I inner
L last
OR
13 14 23 24

13. Draw a Punnett square for the P1x P1 cross.
P1: BBFF x P1: bbff
BF BF BF BF
bf BbFf BbFf BbFf BbFf
bf BbFf BbFf BbFf BbFf
bf BbFf
bf

Draw a Punnett square for F1xF1 cross.
F1: x F1:

14. From your F1xF1 Punnett square cross, examine the F2 generation.
1) List the F1 gametes
2) List the F2 genotypes
3) List the F2 phenotypes

Added by Matthew P.

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