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SI OnlinePlant Genetics(Practice questions)

Topic 10

Spring 2010

Dr. Hughey’s Bio 3 (Lab.)

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A heterozygous white-fruit squash has been pollinated with the pollen of a green- fruited squash.

1) Is it monohybrid or dihybrid cross?

3) What are the genotypes and phenotypes of the F1 generation? What is the ratio in each? Use punnett square.

2) What alleles will be carried by the eggs? By the pollen grains(sperms)?

White fruit is dorminant over colored (W, w).

4) If a heterozygous F1 squash is self-pollinated, what are the genotypes and phenotypes of the F2 generation?

What is the ratio in each? Use punnett square.

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A homozygous green tall maize has been pollinated with pollens of a albino dwarf maize.

4) If the F1 generation is self-pollinated, what will be the appearance of F2 generation?

1) Is it monohybrid or dihybrid cross? What is the parental genotypes?

3) What are the genotypes and phenotypes of the F1 generation? Use punnett square.

- Tall stature is dominant over dwarf stature (T,t).

- Green color is dominant over albino (G,g).

5) What will be the ratio genotypes and the ratio phenotypes in F2 generation?

2) What alleles will be carried by the eggs? By the pollen grains(sperms)?

Is the left corn result from monohybrid cross? Or dihybrid cross? How do you know?

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Is the left corn result from monohybrid cross? Or dihybrid cross? How do you know?

Designed by Pyeongsug Kim, ©2009

Is the above corn result from monohybrid cross? Or dihybrid cross? How do you know?

What are the penotypes in this corn?

What are the POSSIBLE genotypes in this corn? Let, yellow(Y) purple(y) starch(Su) sweet (su)

What are the ratio of phenotypes in this corn?

I choose this two column!But, it’s up to you.