Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN: 9780134580999
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
Bartleby Related Questions Icon

Related questions

bartleby

Concept explainers

Topic Video
Question
Now cross two of the F₁ offspring.
Parent 1
Od Br
Gametes
OR, Or
F2 Offspring
Parent 2
Od hr
Gametes
d, dr
24. What is the phenotypic ratio in the F2 generation?
25. In the dihybrid cross you have considered two traits at a time. Although the number of
traits has increased by one, what has happened to the number of possible phenotypes of
offspring produced in the F2 generation?
expand button
Transcribed Image Text:Now cross two of the F₁ offspring. Parent 1 Od Br Gametes OR, Or F2 Offspring Parent 2 Od hr Gametes d, dr 24. What is the phenotypic ratio in the F2 generation? 25. In the dihybrid cross you have considered two traits at a time. Although the number of traits has increased by one, what has happened to the number of possible phenotypes of offspring produced in the F2 generation?
For
21. What are the genotypes of the F2 generation.
Of the F₁ generation.
Of the parents
22. If it were possible, how would you determine whether a tall individual is heterozygous or
homozygous?
23. How do the observed phenotypes of your seedlings compare with the expected F2 ratio?
To calculate your expected ratio numbers given the total number of seedlings that you counted
use the following steps:
A. Determine your expected ratio. For a monohybrid cross between two F1 plants, both
heterozygous for the trait, you would expect a 3:1 ratio. If you add 3+1, it equals 4.
Therefore, each category is a fraction of 4. This means that you expect the following
fractions 3/4 and 1/4 for the two phenotypic class.
B. Determine your total number of corn plants actually counted.
C. Multiple each fraction by the total number of seedlings you actually counted.
a. For example, if you counted 85 seedlings, you would expect the following:
i. 3/4 X 85= 64 tall seedlings
ii. 1/4 X 85 = 21 dwarf seedlings
D. Add the 2 resulting numbers to verify that they add up to your total number
E. Compare the 2 resulting numbers (your expected numbers) to your actual numbers using
Chi Square statistical analysis (to be completed later in Exercise III).
Exercise II: Dihybrid Cross
Dihybrid crosses involve the inheritance of two different traits. Using the same steps
listed above in the monohybrid crosses, fill in the outline below for the following dihybrid cross.
A tall (dominant) TT, broad-leaf (recessive) bb plant is crossed with a short (recessive) tt,
narrow-leaf (dominant) BB plant.
Parent 1
Gametes
F₁ Offspring
Parent 2
Gametes
67
expand button
Transcribed Image Text:For 21. What are the genotypes of the F2 generation. Of the F₁ generation. Of the parents 22. If it were possible, how would you determine whether a tall individual is heterozygous or homozygous? 23. How do the observed phenotypes of your seedlings compare with the expected F2 ratio? To calculate your expected ratio numbers given the total number of seedlings that you counted use the following steps: A. Determine your expected ratio. For a monohybrid cross between two F1 plants, both heterozygous for the trait, you would expect a 3:1 ratio. If you add 3+1, it equals 4. Therefore, each category is a fraction of 4. This means that you expect the following fractions 3/4 and 1/4 for the two phenotypic class. B. Determine your total number of corn plants actually counted. C. Multiple each fraction by the total number of seedlings you actually counted. a. For example, if you counted 85 seedlings, you would expect the following: i. 3/4 X 85= 64 tall seedlings ii. 1/4 X 85 = 21 dwarf seedlings D. Add the 2 resulting numbers to verify that they add up to your total number E. Compare the 2 resulting numbers (your expected numbers) to your actual numbers using Chi Square statistical analysis (to be completed later in Exercise III). Exercise II: Dihybrid Cross Dihybrid crosses involve the inheritance of two different traits. Using the same steps listed above in the monohybrid crosses, fill in the outline below for the following dihybrid cross. A tall (dominant) TT, broad-leaf (recessive) bb plant is crossed with a short (recessive) tt, narrow-leaf (dominant) BB plant. Parent 1 Gametes F₁ Offspring Parent 2 Gametes 67
Expert Solution
Check Mark
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 Anatomy & Physiology (11th Edition)
Biology
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:PEARSON
Text book image
Biology 2e
Biology
ISBN:9781947172517
Author:Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher:OpenStax
Text book image
Anatomy & Physiology
Biology
ISBN:9781259398629
Author:McKinley, Michael P., O'loughlin, Valerie Dean, Bidle, Theresa Stouter
Publisher:Mcgraw Hill Education,
Text book image
Molecular Biology of the Cell (Sixth Edition)
Biology
ISBN:9780815344322
Author:Bruce Alberts, Alexander D. Johnson, Julian Lewis, David Morgan, Martin Raff, Keith Roberts, Peter Walter
Publisher:W. W. Norton & Company
Text book image
Laboratory Manual For Human Anatomy & Physiology
Biology
ISBN:9781260159363
Author:Martin, Terry R., Prentice-craver, Cynthia
Publisher:McGraw-Hill Publishing Co.
Text book image
Inquiry Into Life (16th Edition)
Biology
ISBN:9781260231700
Author:Sylvia S. Mader, Michael Windelspecht
Publisher:McGraw Hill Education