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In a mutant Jimson weed (Datura stramanicum), chromososme B is present m three c

ID: 73269 • Letter: I

Question

In a mutant Jimson weed (Datura stramanicum), chromososme B is present m three copies whereas all other chromosomes are in the Atomic (diploid) state Jimson weed pollen grains do not tolerate multiple chromosomes and are incapable of fertilization. However, the ovum is capable of fertilization in the trisomic state. If you self fertilized a trisomic Jimson weed plant, what zygotes would be formed? Tell which zygotes are diploid and which are trisomic. Assume that only the univalent mode occurs during meiosis. In some sheep, the presence of horns is produced by an autosomal allele that is dominant in males and recessive in females. What is the term that describe this

Explanation / Answer

B1

B2

B3

B1B2

B1B1B2

B1B2B2

B1B2B3

B2B3

B1B2B3

B2B2B3

B2B3B3

B1B3

B1B1B3

B1B2B3

B1B3B3

B1

B1B1

B1B2

B1B3

B2

B1B2

B2B2

B2B3

B3

B1B3

B2B3

B3B3

Thus, first three rows indicate trisomy condition, while remaining three lines indicate diploid condition zygotes.

B1

B2

B3

B1B2

B1B1B2

B1B2B2

B1B2B3

B2B3

B1B2B3

B2B2B3

B2B3B3

B1B3

B1B1B3

B1B2B3

B1B3B3

B1

B1B1

B1B2

B1B3

B2

B1B2

B2B2

B2B3

B3

B1B3

B2B3

B3B3

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