Genetic Counseling Video Lessons

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Problem: In one of Morgan’s experiments, he crossed his newly discovered white-eyed male with a red-eyed female. (Note that all of the females at that time were homozygous for red eyes because the allele for white eyes had not yet propagated through Morgan’s flies.) All of the F1 flies produced by this cross (both males and females) had red eyes.Next, Morgan crossed the red-eyed F1 males with the red-eyed F1 females to produce an F2 generation. The Punnett square below shows Morgan’s cross of the F1 males with the F1 females.Drag the labels to their appropriate locations to complete the Punnett square for Morgan’s F1 x F1 cross.Drag pink labels onto the pink targets to indicate the alleles carried by the gametes (sperm and egg).Drag blue labels onto the blue targets to indicate the possible genotypes of the offspring.Labels can be used once, more than once, or not at all.

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Problem Details

In one of Morgan’s experiments, he crossed his newly discovered white-eyed male with a red-eyed female. (Note that all of the females at that time were homozygous for red eyes because the allele for white eyes had not yet propagated through Morgan’s flies.) All of the F1 flies produced by this cross (both males and females) had red eyes.

Next, Morgan crossed the red-eyed F1 males with the red-eyed F1 females to produce an F2 generation. The Punnett square below shows Morgan’s cross of the F1 males with the F1 females.

Drag the labels to their appropriate locations to complete the Punnett square for Morgan’s F1 x F1 cross.

  • Drag pink labels onto the pink targets to indicate the alleles carried by the gametes (sperm and egg).
  • Drag blue labels onto the blue targets to indicate the possible genotypes of the offspring.

Labels can be used once, more than once, or not at all.

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Based on our data, we think this problem is relevant for Professor Malina's class at UNL.