Answer the following questions. Submit your answers via Canvas. How does the Nₑ/N ratio affect the above equation? What are the real-world implications of a low or high Nₑ/N ratio? Assume that the Española Galapagos tortoise captive population started with an Nₑ/N ratio of 0.7. Calculate their genetic diversity retained (GDt) given their original population size of 14 tortoises (N=14). Remember, you will first need to solve for Nₑ, then plug Nₑ into the genetic diversity formula. Now let’s work on growing the population.
Added by Joshua S.
Step 1
Let's think step by step. Show more…
Show all steps
Your feedback will help us improve your experience
Supreeta N and 83 other Biology educators are ready to help you.
Ask a new question
Labs
Want to see this concept in action?
Explore this concept interactively to see how it behaves as you change inputs.
Key Concepts
Recommended Videos
Assume that the Española Galapagos tortoise captive population started with an Ne/N ratio of 0.7. Calculate their rate of loss of genetic diversity given their original population size of 12.
Supreeta N.
Consider two genes in a large, randomly mating population of turtles with no mutation. The two alleles at one gene, L and M, do not affect fitness. The two alleles at the other gene, T and t, do affect fitness -- they affect the thickness of turtle shells, and the degree to which they are protected from predation. TT individuals have thick shells, which repel predators, and survive best. Tt individuals have medium shell thickness and survive 88% as well as do TT individuals. tt individuals have thin shells and are easy for predators to eat; they survive only 14% as well as do TT individuals. a) In a population of ADULT turtles, the frequency of individuals with the MM genotype is 0.06. Calculate the frequency of individuals with the LM genotype. b) In a population of gametes at the start of a generation, the frequency of the t allele is 0.23. Calculate the frequency of zygotes with the Tt genotype. c) Continuing from part (b), calculate the frequency of the adults that survive from the zygotes that have the Tt genotype. d) Continuing from part (c), calculate the frequency of the t allele in the gametes that will produce the next generation.
Katlin K.
Homework 4: Heritability, selection, and response to selection R = h^2 S p^2 + 2pq + q^2 = 1 He' = He(1 - 1/2N) FST = 1 / (4Nem + 1) h^2 = VG/Vp Vp = VG + VE New mutation rate and fixation = kvNe = (4NmNf) / (Nm + Nf) p + q = 1 If s > 1/(2Ne), then selection counteracts drift One of the potential problems with supplementing endangered wild populations with captive-bred individuals is that captive-bred organisms often have reduced fitness compared to their wild counterparts. Reasons for this are varied, but work suggests it is a combination of reduced genetic variation in captive-bred populations (small population sizes and assortative mating leading to reduced genetic variation) as well as reduced fitness due to individuals adapting to a captive environment as opposed to a wild environment. Fundy Atlantic salmon (Salmo salar) are an endangered salmon species whose numbers have declined to a point that scientists started to supplement their wild numbers with captive-bred individuals. The question you will answer here is: is supplementing wild salmon populations with captive-bred individuals beneficial if the captive-bred individuals have lower fitness than the wild population? The average number of eggs laid by females in the wild population is about 2,500 per female. The captive-bred individuals typically exhibit about 30% lower fecundity than wild individuals (some estimates are up to 40% lower, but we will use 30% for purposes of this assignment). 1. If the heritability of fecundity is 0.1, what do you predict the fecundity of the new population will be (assume you add just as many new individuals as were already in the wild population)? (2 points) 2. Now consider if the heritability of fecundity was higher, let’s say 0.3. Now what do you predict the fecundity of the new population will be (using all the original numbers, not after one generation of selection)? (2 points) 3. If fecundity exhibits high heritability, what do you predict will happen to population numbers in this population over time if captive-bred individuals are added every year? (2 points)
Madhur L.
Recommended Textbooks
Biology for AP Courses
Objective Biology for NEET
Introduction to General, Organic and Biochemistry
Transcript
18,000,000+
Students on Numerade
Trusted by students at 8,000+ universities
Watch the video solution with this free unlock.
EMAIL
PASSWORD