Campbell Biology in Focus (2nd Edition)
2nd Edition
ISBN: 9780321962751
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece
Publisher: PEARSON
expand_more
expand_more
format_list_bulleted
Concept explainers
Question
Chapter 11, Problem 15TYU
Summary Introduction
To determine:
The effect of late acting dominant lethal alleles on the frequency of the population.
Introduction:
The trend of marrying late and having children later in life is observed in developed countries. This practice has many positive as well as many negative effects. Out of many negative effects one of them is the increased risk of attaining genetic disorders in the off springs.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
2) The year is 2050. The climate has continued to warm. Areas in northern Canada and Alaska are without snow or ice; the average annual temperature has risen and previously snow-covered areas are now shrub land and some temperate forests. What effect would such a climatic change have on the gene pool of the rabbits? All BUT ONE could apply.
A) The allelic frequency has most likely shifted to 85% GG and 15% gg.
B) The dominant allele in the gene pool would become G, the previously rare allele.
C) The allele for white, g, would be scarce and perhaps nonexistent in the population.
D) White rabbits would be at a disadvantage in terms of camouflage and would likely fall prey to predators.
Give typed full explanation
Genes and inheritance have an impact on the lives of parents and their progeny, the F1 and F2 generations. Population genetics also deals with genetics, but in a different way. What is the definition of population genetics? How can the abundance of an allele be different in a population as compared with an individual of the population? (Hint: How can the phenotype of a population differ from that of an individual? Can a population have red flowers, pink flowers, and white flowers? Can one individual have all three types of flowers?)
Chapter 11 Solutions
Campbell Biology in Focus (2nd Edition)
Ch. 11.1 - DRAW IT Pea plants heterozygous for flower...Ch. 11.1 - List all gametes that could be made by a pea plant...Ch. 11.1 - Prob. 3CCCh. 11.2 - For any gene with a dominant allele A and...Ch. 11.2 - Two organisms, with genotypes BbDD and BBDd, are...Ch. 11.2 - Prob. 3CCCh. 11.3 - Incomplete dominance and epistasis are both terms...Ch. 11.3 - Prob. 2CCCh. 11.3 - WHAT IF? A rooster with gray feathers and a hen of...Ch. 11.4 - Beth and Tom each have a sibling with cystic...
Ch. 11.4 - MAKE CONNECTIONS In Table 11.1, note the...Ch. 11 - DRAW IT Two pea plants heterozygous for the...Ch. 11 - A man with type A blood marries a woman with type...Ch. 11 - A man has six fingers on each hand and six toes on...Ch. 11 - Prob. 4TYUCh. 11 - Flower position, stem length, and seed shape are...Ch. 11 - Prob. 6TYUCh. 11 - Prob. 7TYUCh. 11 - Prob. 8TYUCh. 11 - Prob. 9TYUCh. 11 - Prob. 10TYUCh. 11 - In tigers, a recessive allele that is pleiotropic...Ch. 11 - Prob. 12TYUCh. 11 - Imagine that you are a genetic counselor, and a...Ch. 11 - Prob. 15TYUCh. 11 - Prob. 16TYUCh. 11 - Prob. 17TYU
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- Using the HardyWeinberg Law in Human Genetics Suppose you are monitoring the allelic and genotypic frequencies of the MN blood group locus (see Question 2 for a description of the MN blood group) in a small human population. You find that for 1-year-old children, the genotypic frequencies are MM = 0.25, MN = 0.5, and NN = 0.25, whereas the genotypic frequencies for adults are MM = 0.3, MN = 0.4, and NN = 0.3. a. Compute the M and N allele frequencies for 1-year-olds and adults. b. Are the allele frequencies in equilibrium in this population? c. Are the genotypic frequencies in equilibrium?arrow_forwardTay−−Sachs disease is an autosomal recessive neurological disorder that is fatal in infancy. Despite its invariably lethal effect, Tay−−Sachs disease occurs at very high frequency in some Central and Eastern European (Ashkenazi) Jewish populations. In certain Ashkenazi populations, 1 in 800 infants has Tay−−Sachs disease. Population biologists believe the high frequency is a consequence of genetic bottlenecks caused by pogroms (genocide) that have reduced the population multiple times in the last several hundred years. What is the frequncy of the recessive allele and what is the probability a couple are both carriers assuming random mating?arrow_forwardNieman-Pick Syndrome involves a defective enzyme, sphyngomylinase. It is usually fatal before the age of 3. The defective allele frequency is 0.01 in Ashkenazi populations. Let’s call the healthy allele A, and the lethal allele a. a) What is the frequency of allele A? Assuming Hardy-Weinberg equilibrium, how many people do you expect to have the three genotypes in a population of 10,000? b) AA:_______ c) Aa:________ d) aa:_________arrow_forward
- The eugenic movement was created in the early 20th century by Sir Francis Galton. Its aim was to improve the genetic pool of the human population by selective breeding. One idea was to discourage individuals with Mendelian autosomal recessive diseases to have children. However, the fallacy of this idea is shown by the fact that recessive lethal alleles (that are never found in homozygosity) can persist in populations for hundreds to thousands of generations. Which one of the following statements best explains the persistence of those alleles in populations? There is heterozygote advantage in those populations. Recessive alleles keep being produced by mutation. Recessive alleles cannot be selected against when present in heterozygotes. Genetic drift keeps recessive alleles at a relative high frequency in populations. Consider the action of mutation and of genetic drift in a population. What do you expect genetic variation will be in a…arrow_forwardbackground: Lizards often have bright coloration and in some species there is variation in coloration within populations. For the sake of simplicity, let’s assume that color is genetically determined by a single gene with two alleles that interact in a codominant fashion: r+r+ = red, r+r- = yellow, r-r- = white. Imagine there is a large population of these lizards where 1 in 200 lizards have the white coloration, 30 are yellow and the rest are red. A tsunami sweeps through the population! Although no lizards died, 10 random lizards were swept to a nearby island. One of these individuals is white while the rest were yellow. Over time, these individuals remain stuck on the island and form a new population. Eventually, 80% of this population has the white coloration. Assume that color does not affect fitness in either population. question: At the time of the founding of the smaller population, (when 1/10 were white, the rest yellow), what was the chance of fixation of the r- allele via…arrow_forwardSelection confers a reproductive advantage to individuals based on their adaptations, and therefore causes the alleles carried by those individuals to increase in the population. Selection can be simulated by having your partner remove any three individuals of a particular suit as you deal the cards into a pile. The fitness of that variant is therefore 0.77 (10/13 survive), while the fitness of the other three variants remains at 1.0 (13/13 survive). Recalculate allelic (suit) frequencies after selection. 1. What is the effect of selection on reproduction, allelic diversity, and frequency? 2. What would happen if similar selection continued over several generations? Cite references.arrow_forward
- In the genetics unit you learned that sickle cell anemia is an autosomal recessive condition. In 2016, assume in the City of Markham there are 1000 people out of 300000 people who have sickle cell anemia. Assume global warming continues for the next 50 years and in the year 2066 there are 20000 people out of 500000 in Markham who have sickle cell anemia. a)What are the allele frequencies in 2016? What are the allele frequencies in 2066? Is microevolution evident? b)Due to global warming, assume the numbers of malaria carrying mosquitoes in Markham dramatically increased between 2016 and 2066. What do you believe is the main cause of the microevolution in Markham? (Hint- refer to the 5 factors affecting microevolution and refer back…arrow_forward.. Nowadays, newborn babies are required to be tested for phynylketonuria (PKU), an autosomal recessive genetic disorder. If untreated, individual homozygous for PKU suffer mental retardation. In a recent year, 4 PKU babies were detected out of 126,000 tested. Assuming Hardy-Weinberg conditions, what is the frequency of the PKU gene in this population (Give your answer in decimal number with 3 decimal places)?arrow_forward1) In cats, the allele for white fur(W) is completely dominant and will result in cats with all white fur in both the homozygous dominant and heterozygous cases. Suppose you look at 50 cats and notice that none of them are completely white. What's the allele frequency for the white fur allele in this population? 2) In carnations, the allele that makes red pigment (R) in flowers is incompletely dominant. Flowers that are red are homozygous dominant and those are pink are heterozygous. White flowers (r) are the result of the recessive allele. Suppose you look at a field of 100 carnations and notice 42 of the plants produce red flowers, 42 have pink flowers, and 16 produce white flowers. What's the allele frequency for both the red (R) and white (r) alleles?arrow_forward
- Posted a picture of my questionarrow_forwardEVOLUTION CONNECTION Over the past half century, therehas been a trend in the United States and other developedcountries for people to marry and start families later in lifethan did their parents and grandparents. What effects mightthis trend have on the incidence (frequency) of late-actingdominant lethal alleles in the population?arrow_forwardThe ability to roll your tongue is a dominant genetic trait passed on from generation to generation. Tongue rolling is the ability to roll the lateral edges of your tongue upward into a tube. The frequency of the tongue rolling trait was collected from 1,000 individuals each year 1925 to 2000 and is show in the data table below. Year Tongue Rolling Inability to Roll Tongue 1925 67% 33% 1950 68% 32% 1975 63% 37% 2000 67% 33% (a) Determine if the human population was in equilibrium from 1925 to 2000. Justify your response. (b) (b) Discuss how the Hardy Weinberg Principle can be used to determine whether this population is evolving (c) (c) Identify and describe THREE factors that would affect whether the population of Tongue Rollers is in Hardy Weinberg equilibrium. (d) (d) A scientist recently stated a claim that it is unlikely that the inability to roll your tongue will disappear from the population. Provide reasoning to explain…arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Human Heredity: Principles and Issues (MindTap Co...BiologyISBN:9781305251052Author:Michael CummingsPublisher:Cengage Learning
Human Heredity: Principles and Issues (MindTap Co...
Biology
ISBN:9781305251052
Author:Michael Cummings
Publisher:Cengage Learning