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Chapter 6: Problem 13

The primrose, Primula kewensis, has 36 chromosomes that are similar in appearance to the chromosomes in two related species, \(P .\) floribunda $(2 n=18)\( and \)P\(. verticillata \)(2 n=18) .$ How could P. kewensis arise from these species? How would you describe \(P\) kewensis in genetic terms?

Short Answer

Expert verified
Describe P. kewensis in genetic terms. Answer: Primula kewensis likely arose as an allopolyploid species, where a hybridization event between P. floribunda and P. verticillata, both having 18 chromosomes, resulted in the formation of P. kewensis, having 36 chromosomes. Each parent species contributed their entire set of chromosomes to create P. kewensis.

Step by step solution

01

Identify the chromosome numbers of the species

We are given three species and their respective chromosome numbers: - Primula kewensis: \(2n = 36\) - P. floribunda: \(2n = 18\) - P. verticillata: \(2n = 18\)
02

Analyze the relationship between the chromosome numbers

To determine how P. kewensis arose from P. floribunda and P. verticillata, we should investigate the relationship between their chromosome numbers. It can be observed that the number of chromosomes of P. kewensis (36) is double the number of chromosomes of P. floribunda (18) and P. verticillata (18).
03

Hypothesize the genetic mechanism involved

Since the P. kewensis has double the number of chromosomes of P. floribunda and P. verticillata, it suggests that P. kewensis could be an allopolyploid species. Allopolyploid species arise from a hybridization event between two different species, followed by a genome duplication, in which the chromosomes from both the parent species are combined into a new species. In this scenario, both P. floribunda and P. verticillata could have contributed their entire set of chromosomes to create P. kewensis.
04

Describe P. kewensis in genetic terms

P. kewensis can be described as an allopolyploid species, with a diploid chromosome number of 36, which likely arose from a hybridization event between P. floribunda and P. verticillata, where both species contributed their chromosomes to the formation of P. kewensis.

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Most popular questions from this chapter

Certain varieties of chrysanthemums contain \(18,36,54,72,\) and 90 chromosomes; all are multiples of a basic set of nine chromosomes. How would you describe these varieties genetically? What feature do the karyotypes of each variety share? A variety with 27 chromosomes has been discovered, but it is sterile. Why?

Mendelian ratios are modified in crosses involving autotetraploids. Assume that one plant expresses the dominant trait green seeds and is homozygous (WWWW). This plant is crossed to one with white seeds that is also homozygous (wwww). If only one dominant allele is sufficient to produce green seeds, predict the \(\mathrm{F}_{1}\) and \(\mathrm{F}_{2}\) results of such a cross. Assume that synapsis between chromosome pairs is random during meiosis.

Define these pairs of terms, and distinguish between them. aneuploidy/euploidy monosomy/trisomy Patau syndrome/Edwards syndrome autopolyploidy/allopolyploidy autotetraploid/amphidiploid paracentric inversion/pericentric inversion

A boy with Klinefelter syndrome \((47, \mathrm{XXY})\) is born to a mother who is phenotypically normal and a father who has the X-linked skin condition called anhidrotic ectodermal dysplasia. The mother's skin is completely normal with no signs of the skin abnormality. In contrast, her son has patches of normal skin and patches of abnormal skin. (a) Which parent contributed the abnormal gamete? (b) Using the appropriate genetic terminology, describe the meiotic mistake that occurred. Be sure to indicate in which division the mistake occurred. (c) Using the appropriate genetic terminology, explain the son's skin phenotype.

In a cross between two varieties of corn, \(g l_{1} g l_{1} W s_{3} W s_{3}(\) egg parent) \(\times G I_{1} G l_{1} w s_{3} w s_{3}\) (pollen parent), a triploid offspring was produced with the genetic constitution $G l_{1} G l_{1} g l_{1} W s_{3} w s_{3} w s_{3}\( From which parent, egg or pollen, did the \)2 n$ gamete originate? Is another explanation possible? Explain.
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