Genetic Analysis: An Integrated Approach (2nd Edition)
Genetic Analysis: An Integrated Approach (2nd Edition)
2nd Edition
ISBN: 9780321948908
Author: Mark F. Sanders, John L. Bowman
Publisher: PEARSON
bartleby

Concept explainers

bartleby

Videos

Textbook Question
Book Icon
Chapter 20, Problem 23P

Three-spined stickleback fish live in lakes formed when the last ice age ended 10 , 000 to 15 , 000 years ago. In lakes where the sticklebacks are prey for larger fish, they develop 35 bony plates along their body as armor. In contrast, sticklebacks in lakes where there are no predators develop only a few or no bony plates.

a. In crosses between fish of the two different morphologies, the lack of bony armor segregates as a recessive trait that maps to the ectodermal dysplasia (Eda) gene. Comparisons between the Eda coding regions of the armoured and nonarmored fish revealed no differences. How can you explain this result?

b. Loss of function mutations in the coding region of the homologous gene in humans result in loss of hair, teeth, and sweat glands, as in the toothless men of Sind (India). What does this suggest about hair, teeth, and sweat glands in humans?

Blurred answer
Students have asked these similar questions
For a particular rodent, black fur is dominant over brown fur, and a long tail is dominant over a short tail. Give the possible genotypes and phenotypes of the possible offspring that could result from the breeding of a homozygous black fur and heterozygous tail rodent and a rodent of heterozygous for both traits.
The hair keratin gene KRTHAP1 was lost in the human lineage. Keratins are a major component of hairs. Humans still have nine functional type I hair keratin genes but the loss of that particular gene may have caused the thinning of human body hair. The gene loss occurred relatively recently in human evolution—less than 240,000 years ago. What does this tell you about the possible phenotypic appearance of the humanoids living at that time? a. Denisovans likely had excessive body hair. b. The immediate precursors to anatomically modern humans must have been extremely hirsuit. c. We would expect to see a significant diminution in body hair in the hominids living around 240KYA consistent with the loss of this gene. d. Neanderthals probably had thick wooly manes of body hair. e. Homo ergaster probably had no body hair
a) Which two species are the most closely related? b) Are pike more closely related to lungfish or to gorillas?

Chapter 20 Solutions

Genetic Analysis: An Integrated Approach (2nd Edition)

Knowledge Booster
Background pattern image
Biology
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
SEE MORE QUESTIONS
Recommended textbooks for you
Text book image
Human Heredity: Principles and Issues (MindTap Co...
Biology
ISBN:9781305251052
Author:Michael Cummings
Publisher:Cengage Learning
Text book image
Concepts of Biology
Biology
ISBN:9781938168116
Author:Samantha Fowler, Rebecca Roush, James Wise
Publisher:OpenStax College
Text book image
Biology Today and Tomorrow without Physiology (Mi...
Biology
ISBN:9781305117396
Author:Cecie Starr, Christine Evers, Lisa Starr
Publisher:Cengage Learning
Text book image
Aquaculture Science
Biology
ISBN:9781133558347
Author:Parker
Publisher:Cengage
The Evolution of Populations: Natural Selection, Genetic Drift, and Gene Flow; Author: Professor Dave Explains;https://www.youtube.com/watch?v=SRWXEMlI0_U;License: Standard YouTube License, CC-BY
The Evolution of Humans | Evolution | Biology | FuseSchool; Author: FuseSchool - Global Education;https://www.youtube.com/watch?v=Vf_dDp7drFg;License: Standard YouTube License, CC-BY