
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN: 9780134580999
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
expand_more
expand_more
format_list_bulleted
Concept explainers
Topic Video
Question

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?

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

This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
This is a popular solution
Trending nowThis is a popular solution!
Step by stepSolved in 3 steps

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
- Topic: Trihybrid Cross, Height in merigonias is determined by three unlinked genes that act additively. Each has two alleles, one compltely dominant allele(A,B or C) that makes plants taller and one recessive allele that makes plants shorter. Do the corss AaBbCc X AaBbCc. The fraction of The F1 progenty will be ? Pls explain it with more details. thanksarrow_forwardO e. Parent 2: Parent 1: Parent 2: ¡Ai QUESTION 9 Bi QUESTION 8 Let's assume that, in dragons, red scales (B) are dominant to green scales (b), and long tongues (S) are dominant to short tongues (s). The genes that determine these characteristics assort independently. A homozygous red, long-tongued dragon is crossed with a homozygous green, short-tongued dragon. If an F1 dragon is crossed to a homozygous green and homozygous short-tongued dragon, what phenotypes and proportions are expected in the offspring? O a. 100% green and long-tongued O b. ½ green and short-tongued & ½ red and long-tongued O c. ½ red and short-tongued & ½ green and long-tongued O d.% red and long-tongued, % red and short-tongued, ½ green and long-tongued, % green and short-tongued O e. 9/16 red, long-tongued, 3/16 green, long-tongued, 3/16 red, short-tongued, 1/16 green, short-tongued Save and Submit to save and submit. Click Save All Answers to save all answers. 000 MacBook Airarrow_forwardHow do you know which one number is for S/Tu or U/Tu I know both equals 36.6arrow_forward
- What is the genotype of the parents of the corn dihybrid cross described above? What are the phenotypes of the parents of the corn dihybrid cross described above? What are the possible genotypes of the parent gametes of the corn dihybrid cross described above?arrow_forwardCan you draw punnet square for F1 and F2 for this crossarrow_forwardWrite the cross using correct symbols. What kind of cross is this called?arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- Human Anatomy & Physiology (11th Edition)BiologyISBN:9780134580999Author:Elaine N. Marieb, Katja N. HoehnPublisher:PEARSONBiology 2eBiologyISBN:9781947172517Author:Matthew Douglas, Jung Choi, Mary Ann ClarkPublisher:OpenStaxAnatomy & PhysiologyBiologyISBN:9781259398629Author:McKinley, Michael P., O'loughlin, Valerie Dean, Bidle, Theresa StouterPublisher:Mcgraw Hill Education,
- Molecular Biology of the Cell (Sixth Edition)BiologyISBN:9780815344322Author:Bruce Alberts, Alexander D. Johnson, Julian Lewis, David Morgan, Martin Raff, Keith Roberts, Peter WalterPublisher:W. W. Norton & CompanyLaboratory Manual For Human Anatomy & PhysiologyBiologyISBN:9781260159363Author:Martin, Terry R., Prentice-craver, CynthiaPublisher:McGraw-Hill Publishing Co.Inquiry Into Life (16th Edition)BiologyISBN:9781260231700Author:Sylvia S. Mader, Michael WindelspechtPublisher:McGraw Hill Education

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

Biology 2e
Biology
ISBN:9781947172517
Author:Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher:OpenStax

Anatomy & Physiology
Biology
ISBN:9781259398629
Author:McKinley, Michael P., O'loughlin, Valerie Dean, Bidle, Theresa Stouter
Publisher:Mcgraw Hill Education,

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

Laboratory Manual For Human Anatomy & Physiology
Biology
ISBN:9781260159363
Author:Martin, Terry R., Prentice-craver, Cynthia
Publisher:McGraw-Hill Publishing Co.

Inquiry Into Life (16th Edition)
Biology
ISBN:9781260231700
Author:Sylvia S. Mader, Michael Windelspecht
Publisher:McGraw Hill Education