generations)? 1b. In 1884 the population had grown to 106 when disaster struck the island. Of the 19 adult men on the island, 15 were in the same fishing boat that capsized, leaving only 4 adult men alive on the island. These desperate times may have changed the sex ratio of the breeding population on the island. Let’s say that now, each man fathered children with an average of 1.5 different women (male:female ratio of 1:1.5). If we start back with a heterozygosity of 0.5 from this point, given the effective population size on Tristan da Cunha, what is the expected heterozygosity in the current population 7 generations later? 1c. The scenarios described in 1a and 1b are examples of which two evolutionary phenomena, respectively?
Genetic Variation
Genetic variation refers to the variation in the genome sequences between individual organisms of a species. Individual differences or population differences can both be referred to as genetic variations. It is primarily caused by mutation, but other factors such as genetic drift and sexual reproduction also play a major role.
Quantitative Genetics
Quantitative genetics is the part of genetics that deals with the continuous trait, where the expression of various genes influences the phenotypes. Thus genes are expressed together to produce a trait with continuous variability. This is unlike the classical traits or qualitative traits, where each trait is controlled by the expression of a single or very few genes to produce a discontinuous variation.
The remote South Atlantic island of Tristan da Cunha was first colonized in 1818 by exactly 20 people, 12 men and 8 women. It’s reasonable to assume that the starting
1a. If these conditions held constant – what would the expected heterozygosity be in the population today (2018 to deal with a clean integer value for generations)?
1b. In 1884 the population had grown to 106 when disaster struck the island. Of the 19 adult men on the island, 15 were in the same fishing boat that capsized, leaving only 4 adult men alive on the island. These desperate times may have changed the sex ratio of the breeding population on the island. Let’s say that now, each man fathered children with an average of 1.5 different women (male:female ratio of 1:1.5). If we start back with a heterozygosity of 0.5 from this point, given the effective
1c. The scenarios described in 1a and 1b are examples of which two evolutionary phenomena, respectively?
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