Listed below are 7 two-factor interaction ratios observed in progeny from various dihybrid parents. Suppose that in each of these cases one of the dihybrid parents is testcrossed (instead of being mated to another dihybrid individual). What phenotypic ratio is expected in the progeny of each testcrosses? (1) 9:6:1; (2) 9:3:4; (3) 9:7; (4) 12:3:1; (5) 9:3:3:1; (6) 13:3.
Added by Justin H.
Step 1
In a testcross, we would expect a 1:1 ratio of the two most common phenotypes. (2) 9:3:4 - This ratio suggests that one gene is epistatic to the other. In a testcross, we would expect a 1:1 ratio of the two most common phenotypes. (3) 9:7 - This ratio suggests Show more…
Show all steps
Close
Your feedback will help us improve your experience
Arun Bana and 86 other Biology educators are ready to help you.
Ask a new question
Labs
Want to see this concept in action?
Explore this concept interactively to see how it behaves as you change inputs.
Key Concepts
Recommended Videos
An A/a; B/b dihybrid is testcrossed, and about 3/4 of the progeny phenotypically resembles the dihybrid parent, while 1/4 resembles the tester parent. If the dihybrid parent was selfed, what would be the expected phenotypic ratio in the progeny? a. 9:3:4 b. 12:3:1 c. 9:3:3:1 d. 9:7 e. 15:1 f. 13:3
Bryan V.
Adi S.
Crosses involving parents that are heterozygous for two traits $(A a B b \times A a B b)$ lead to offspring with phenotypic ratios close to _____. a. 1: 2: 1 b. 1: 1: 1: 1 c. 3: 1 d. 9: 3: 3: 1
Recommended Textbooks
Biology for AP Courses
Objective Biology for NEET
Introduction to General, Organic and Biochemistry
Transcript
18,000,000+
Students on Numerade
Trusted by students at 8,000+ universities
Watch the video solution with this free unlock.
EMAIL
PASSWORD