Show
This preview shows page 1 - 2 out of 3 pages. Using Genetic Crosses to analyze a stickleback trait (adapted from HHMI biointeractive)The activity also uses research data published by Dr. William Cresko at the University of Oregon. The original paper may beobtained here:.The fish shown in the photo on the left is a marinethreespine stickleback. Like all marine and sea-runstickleback, this fish has a pair of pelvic spines (only one isvisible in the photo), which serve as a defense from largepredatory fish. In some freshwater populations, such as inBear Paw Lake, Alaska, stickleback lack pelvic spines.(The scale is in centimeters.)Part 1—Stating the Hypothesis: Which Phenotype Is Dominant?Examine the offspring of a genetic cross between a stickleback from the ocean (marine stickleback) and a freshwaterstickleback from Bear Paw Lake.1. Based on what you learned in the film, what are the phenotypes of these two parental stickleback fish?Indicate your choice with a check mark. Get answer to your question and much more Upload your study docs or become a Course Hero member to access this document Upload your study docs or become a Course Hero member to access this document End of preview. Want to read all 3 pages? Upload your study docs or become a Course Hero member to access this document Tags Ratio, Bear Paw Lake, F1 hybrid Are pelvic spines dominant or recessive in stickleback fish?The dominant allele of the stickleback fish is producing a pelvic spine because when there is a change in the environment, stickleback fish with pelvic spines accumulate in higher frequencies This information was gathered from the video, “Making of the Fittest: Evolution of the Stickleback Fish - HHMI Biointeractive ...
Why do you think stickleback fish with a Pitx1 mutation are able to survive but not the mice?c) Why do you think stickleback fish with a Pitx1 mutation are able to survive but not the mice? By knocking out the protein-coding region of the Pitx1 gene in mice, the gene can no longer be expressed in any cells of the organism. The Pitx1 protein is critical for the normal development of the pituitary gland and jaw.
How do pelvic spines and other spines protect ocean stickleback fish?in the form of bony plates and spines projecting from the back and pelvis. When threatened, a stickleback can simultaneously flare out its pair of pelvic spines and three dorsal spines, making it difficult for predators to swallow them.
Which one of the three pelvic girdle phenotypes is analyzed in more detail in this experiment?The reduced pelvis phenotype is analyzed in more detail in this experiment.
|
What is the ratio of fish with pelvic spines to fish without pelvic spines in the f1 generation?
zusammenhängende Posts
Urheberrechte © © 2024 defrojeostern Inc.
