In order to determine the relative order of genes on a chromosome, scientists use: Select one: ? a. a two-point testcross ? b. a one-point testcross ? c. a dihybrid cross between two heterozygotes ? d. a three-point testcross ? e. a trihybrid cross between two heterozygotes
Added by Mary C.
Close
Step 1
Step 1: A three-point testcross is used to determine the relative order of genes on a chromosome. Show more…
Show all steps
Your feedback will help us improve your experience
Adi S and 74 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
LONG MULTIPLE CHOICE (5 marks) A three-point test cross results in the following F2 phenotype ratios (note that order of phenotypes does not represent the order of genes): Phenotype Number of offspring Z b c 55 z B c 38 z b c 280 Z B c 4 z b C 7 Z B C 290 Z b C 44 z B C 55 total 773 Q1 What is the order of genes Z, B and C? (1 mark) B Z C Z B C Z C B Q2 To which gene combinations do the following map distances pertain? (2 marks) 15.65 m.u.: 12.03 m.u.: Q3 What is the coefficient of coincidence (c)? (1 mark) 0.76 1.52 1.76 1.84 2.56 Q4 What level of interference (I) is experienced between these loci? (1 mark) -1.24 -0.84 -0.64 0.52 0.24
Adi S.
The recessive alleles k (kidney-shaped eyes instead of wild-type [+] round), c (cardinal-colored eyes instead of wild-type red), and e (ebony body instead of wild-type gray) identify three genes on chromosome 3 of Drosophila. Females with kidney-shaped, cardinal-colored eyes were mated with ebony males. The F1 was wild-type. When F1 females were testcrossed with kk cc ee males, the following progeny phenotypes were obtained: k c e 3 k c + 876 k + e 67 k + + 49 + c e 44 + c + 58 + + e 899 + + + 4 A. Determine the order of the genes and the map distances. (6 points) B. Using genetics notation for linked genes and denoting the sexes, what were the genotypes of the parentals? (4 points) C. Using genetics notation for linked genes, what was the genotype of the F1 used in the testcross? (2 points) D. Calculate the coefficient of coincidence and interference. (4 points)
Jenny W.
Which of the following crosses is a geneticist most likely to use to determine the genotype of an individual that is displaying the dominant phenotype? Dihybrid cross Monohybrid cross Self-fertilization Simple test cross Calculate the probability of the production of a homozygous recessive genotype for all genes in the following cross: AaBbccddEeFf x AaBbCcddEeFf 1/1024 1/4096 1/512 1/256
Bryan V.
Recommended Textbooks
Biology for AP Courses
Objective Biology for NEET
Introduction to General, Organic and Biochemistry
Transcript
Watch the video solution with this free unlock.
EMAIL
PASSWORD