if two genes are on the same chromosome and are far enough apart that they undergo recombination at least 50% of the time, the genes are independently assorting and do not show linkage.
Given genes 28cM apart.. there are 4 gametes formed
Both recombinant gamete should be observed equally frequently :- 1/2(0.28)= 0.14
The parentral gametes are observed when there is no crossover between the genes: 100%-28% = 72%
Perecntage of gametes recombinant are 14%+14%= 28%
5. In humans, if two genes are 28 CM apart on the same chromosome, what percentage...
The B and N genes are 25 map units apart on a chromosome. a) Following a dihybrid testcross, how many offspring of 250 would you expect to display a recombinant phenotype? a) If you performed a dihybrid testcross, with a cis dihybrid, what would be the genotypes of both recombinant offspring phenotypic classes?
If two bacterial genes are 0.5 minutes apart on the bacterial chromosome, what frequency of cotransductants would you expect to observe in a P1 transduction experiment in E.coli (3 points) 3.
Explain why two genes 50 or more map units apart on a genetic map can only result in a maximum of 50% recombinant gametes in two point cross. To answer this, ask yourself what percentage of recombinant gametes would result if the probability of crossing over in a tetrad involving these genes were 100%, as it would be if the two genes are 50 or more map units apart.
Two genes, A and B, are 64 cM apart on a chromosome. How can we measure the genetic distance between A and B? In a test cross between a double heterozygote and a homozygous recessive individual, we should observe 64% recombinant progeny If gene C lies between A and B, we can measure the recombination rate between A-C and C-B. Both of the above will work There is no way to measure genetic distance greater than 50 cM. I know...
If two genes are 24 cM apart on a genetic linkage map, how many recombinant offspring would you expect out of 150? A. Depends if they are cis or trans B. 18 C. 24 D. 36 E. 12
Genes A and B are located on the same chromosome 10 centimorgans apart. What is the likelihood of AB/ab progeny in a cross between Ab/aB and ab/ab individuals? a. 1/20 b. 1/10 c. 1/4 d. 9/20 e. 9/10
Which of these statements is incorrect? Syntenic genes are located on the same chromosome. Independent assortment results in recombinant chromosomes. You can reliably predict the relative genetic distance from genes’ physical distance on a chromosome. Linked genes are always syntenic. What is the relative genetic distance between two linked genes if the recombination frequency is 0.49? 0.49 cM 4.9 cM 49 cM 490 cM What statement best explains the distortion in Mendelian ratios observed by Bateson & Punnett in 1905?...
In flamingos, genes A and B are known to be 21 map units apart on chromosome #5. You mate an AA:BB male with an aa:bb female to produce F1 flamingos. a. What gametes will be made by these F1 individuals and in what proportions? b. When the F1's are bred to each other, they produce a total of 276 offspring. How many of these offspring would you predict should have the genotype Aa:BB?
When determining map distance between two genes that are far apart on the same chromosome, it is most accurate to add up the recombination frequencies of genes between the two outside genes because The recombination frequency between the two outside genes will be an over-estimate of the actual distance due to double cross-overs By adding up the smaller distances you can account for MANY of the double cross-overs that occurred between the two closest genes. By adding up the smaller...
Required information The recombination frequency between genes that are located on different chromosomes is 50%, a hallmark of independent assortment. Genes that are located close together on the same chromosome have a recombination frequency less than 50%, which is an indication of linkage. Complete the following questions to investigate recombination frequency between genes that are far apart on the same chromosome. Two genes on the same chromosome may have no crossover (NCO), a single crossover (SCO), or a double crossover...