This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: To express a polygenic trait: a. genes must interact with the environment. b. several genes must ... (Read 104 times)

cherise1989

  • Hero Member
  • *****
  • Posts: 555
on: Jun 25, 2018
To express a polygenic trait:
 
  a. genes must interact with the environment.
  b. several genes must act together.
  c. multiple mutations must occur in the same family.
  d. penetrance must occur.

Question 2

The gradual increase in height among the human population over the past 100 years is an example of:
 
  a. a polygenic trait.
  b. a multifactorial trait.
  c. crossing over.
  d. recombination.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

jordangronback

  • Sr. Member
  • ****
  • Posts: 339
Reply #1 on: Jun 25, 2018
Answer to Question 1

ANS: B
Polygenic traits are those that result from several genes acting together. When environmental factors influence the expression of the trait, the term multifactorial inheritance is used. When multiple mutations occur in the same family, the mechanism most likely responsible is termed germline mosaicism. Penetrance of a trait is the percentage of individuals with a specific geno-type who also exhibit the expected phenotype.

Answer to Question 2

ANS: B
The gradual increase in height is an example of multifactorial traits influenced by genes and also by environment. Polygenic traits result from several genes acting together. Crossing over is an abnormal chromosome structure. Recombination results from new arrangements of alleles.


cherise1989

  • Member
  • Posts: 555
Reply 2 on: Jun 25, 2018
Wow, this really help

helenmarkerine

  • Member
  • Posts: 324
Reply 3 on: Yesterday
Excellent

« previous next »
 

Did you know?

Liver spots have nothing whatsoever to do with the liver. They are a type of freckles commonly seen in older adults who have been out in the sun without sufficient sunscreen.

Did you know?

There can actually be a 25-hour time difference between certain locations in the world. The International Date Line passes between the islands of Samoa and American Samoa. It is not a straight line, but "zig-zags" around various island chains. Therefore, Samoa and nearby islands have one date, while American Samoa and nearby islands are one day behind. Daylight saving time is used in some islands, but not in others—further shifting the hours out of sync with natural time.

Did you know?

According to the National Institute of Environmental Health Sciences, lung disease is the third leading killer in the United States, responsible for one in seven deaths. It is the leading cause of death among infants under the age of one year.

Did you know?

Though Candida and Aspergillus species are the most common fungal pathogens causing invasive fungal disease in the immunocompromised, infections due to previously uncommon hyaline and dematiaceous filamentous fungi are occurring more often today. Rare fungal infections, once accurately diagnosed, may require surgical debridement, immunotherapy, and newer antifungals used singly or in combination with older antifungals, on a case-by-case basis.

Did you know?

Drug abusers experience the following scenario: The pleasure given by their drug (or drugs) of choice is so strong that it is difficult to eradicate even after years of staying away from the substances involved. Certain triggers may cause a drug abuser to relapse. Research shows that long-term drug abuse results in significant changes in brain function that persist long after an individual stops using drugs. It is most important to realize that the same is true of not just illegal substances but alcohol and tobacco as well.

Structure and formation of the homologous ?-globin genes in mice and rats Structure and formation of the homologous ?-globin genes in mice and rats
For linked genes, recombinant frequencies are less than 50 percent For linked genes, recombinant frequencies are less than 50 percent
Air masses interact to produce weather Air masses interact to produce weather
Mutations in human mitochondrial genes leading to disease syndromes Mutations in human mitochondrial genes leading to disease syndromes
Polygenic inheritance of wheat kernel color controlled by two additive genes Polygenic inheritance of wheat kernel color controlled by two additive genes
Alternative sigma factors for heat shock genes Alternative sigma factors for heat shock genes
Video: Introduction to Cystic Fibrosis

For a complete list of videos, visit our video library