21 Please answer 20 and 21 uestion 2 This figure illustrates the concept of a ri

Question

21

Please answer 20 and 21

uestion 2 This figure illustrates the concept of a ring species formation in Ensatina eschscholti salamanders in California. The species originated in northern California and southern Oregon and then expanded south along the Sierra Nevada range. Which statement accurately describes gene flow and gene patterns in these populations? Ensatina eschscholtzii picta E. e. platensis E.e. xanthoptica E. e. croceater E. e. eschscholtzi E. e. klauberi Zone of hybridization E. e. platensis E. e. croceater E. e. picta E. e. klauberi E.e. oregonensiS E. e. xanthoptica E. e. eschscholtzi lick to view larger ima Gene flow decreases as you move south, resulting in the southern populations being more genetically similar to one another than other populations. Gene flow decreases as you move south, resulting in the southern populations being more genetically distinct from one another than other populations. Gene flow decreases through the middle part of the range but increases as the species comes back in contact at the southern end of the range Gene flow increases as you move south, resulting in little genetic differentiation between the southern species when compared to other species in the range

Explanation / Answer

20) A. Gene flow decreases as we move south, resulting in southern populations being more genetically similar to one another than other populations.

Gene flow between genetically distant populations reduces the genetic difference between the populations

21) D. Hybrids had significantly better fitness than the other subspecies in the hybrid zone, supporting the bounded hybrid superiority model.

The bounded-hybrid superiority hypothesis (BHSH) predicts stable hybrid zones are characterized by hybrids having the highest fitness within the zone. Hybridization between two populations/species can lead to hybrid superiority, the increased resistance compared to one or both parents

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