If one species (2n = 10) crosses with another species (2n = 18), producing an allopolyploid offspring, what is the ploidy of the offspring?
a. 2n = 10
b. 2n = 18
c. 2n = 10+18 = 28
d. 4n = 36 +20 = 56

검증된 단계별 안내

Understand the concept of allopolyploidy: Allopolyploidy occurs when two different species interbreed, resulting in offspring with a combination of the parental species' chromosome sets.

Identify the chromosome numbers of the parent species: The first species has a diploid number of 2n=10, and the second species has a diploid number of 2n=18.

Determine the chromosome contribution from each parent: In an allopolyploid, the offspring typically receives one complete set of chromosomes from each parent species.

Calculate the total chromosome number in the offspring: Add the chromosome numbers from both parent species to find the total chromosome number in the offspring.

Consider the ploidy level: Since the offspring is an allopolyploid, it will have a ploidy level that is the sum of the chromosome sets from both parents, resulting in a new diploid number.

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주요 개념

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Allopolyploidy

Allopolyploidy refers to the formation of a polyploid organism through the hybridization of two different species. This process involves the combination of the complete sets of chromosomes from each parent species, resulting in offspring with a higher chromosome number than either parent. It is a common mechanism in plant evolution, leading to new species with unique genetic combinations.

Chromosome Number

Chromosome number is the total count of chromosomes present in the nucleus of a cell. In diploid organisms, represented as 2n, chromosomes exist in pairs. When two species with different chromosome numbers cross, the resulting offspring's chromosome number is typically the sum of the two parent species' chromosome numbers, especially in cases of allopolyploidy.

Hybridization

Hybridization is the process of crossing two genetically distinct species or varieties to produce offspring with traits from both parents. In the context of allopolyploidy, hybridization leads to the combination of different sets of chromosomes, creating a new organism with genetic material from both parent species. This can result in increased genetic diversity and novel characteristics in the offspring.