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Practice Problems 7: Chromosome Variation in Structure 1. A petunia is heterozygous for the following inversion...
1. A flower is heterozygous for the following inversion of chromosome 1 (dot=centromere) A B C ● D E F G a b e d ● c f g a. Is this a paracentric or pericentric inversion? I am thinking Pericentric? b. Draw the pairing configuration at prophase I including all 4 chromatids. I wasnt too sure how to map the loop out for this one c. Give the genotypes of the gametes from this meiosis if there is a...
Inversion Problems: An individual is heterozygous for an inversion: ADCBEFG HI, and during gamete formation there is a crossing over event between C and B. Draw chromosome structure pre and post meiosis. Be sure to label the chromatids/chromosomes with the appropriate sequence of genes. Label mutant and wild type chromatids/chromosomes, viable and non-viable gametes. Circle and identify the mutations in the non-viable gametes inuerston If an individual is heterozygous for an inversion, ABC DGFEHI, and a crossing over event occurred...
Mr Crabs suffers from semi-sterility due to a pericentric inversion on chromosome #10. His normal chromosome #10 has the sequence of genes as follows (the dot represents the centromere): ABCD·EFGH. His inverted #10 has the sequence: AFE·DCBGH. a. What proportion of Mr Crab’s gametes will be viable if no crossing over occurs within the inverted segment? b. What proportion of Mr Crab’s gametes will be viable if a cross over occurs between genes F-E? c. What is the sequence of...
1) given the following sequence of genes on a chromosome, determine what change in chromosome structure occurred. the asterisk indicates the centromere before: A B C D * E F G H after: A C D * E F G H a) inversion b) gene duplication c) terminal deletion d) interstitial deletion 2) given the following sequence of genes on a chromosome, determine what change in chromosome structure occurred. the asterisk indicates the centromere before: A B C D *...
19. A viable inversion heterozygote is undergoing meiosis. The chromosomes are illustrated below. Compare the consequences of crossing over in two cases: crossing over between C and D, and crossing over between F and G ABCDEFGHIJK 2 ABCHG FEDIJK 20. Using the same inverted chromosome above: a. Two crossing over events occur among these chromatids: a crossover between genes H and G on chromatids 2 and 4, and a crossover between genes D and E on chromatids 1 and 3....
In this diagram, the top chromosome is the wild-type chromosome, while the bottom one carries an inversion. The star is the centromere. A B C * D E F G A B F E D * C G 1. During meiosis recombination occurs between the centromere and the region marked "D". Draw out the recombinant gametes showing the gene order and position of the centromeres in each. 2. Are either of the recombinant gametes likely to give rise to viable...
1. During meiosis when crossing over occurs in a paracentric inversion loop, what percent of the meiotic products will result in nonviable gametes? (0.5 points) a. 0% b. 25% c. 50% d. 75% e. 100%
1. An inversion heterozygote has the following inverted chromosome: ABCD JIHGF.EKLM. a. Sketch how this chromosome will pair with its normal homologue (AB CDE FGHIJ K L M) in prophase I. Make sure you include all strands (remember, the chromosomes are replicated). (2 pts) b. What four gametes result when a single crossover occurs between genes F and G on one inversion and one normal chromosome? (4 pts)
11. A normal chromosome and its homolog carrying an inversion are given below (Y* = centromere) Normal: ABCDEFGH Inversion: a dcbe*fgh Answer the following questions about these homologs (8 points total) 11c. Suggest four gamete genotypes that could be produced during a single episode of meiosis if there is a is a crossover between B & C in the inversion heterozygote. Be sure to indicate the position of the centromere with a * Write V or I beside each gamete...
An individual is heterozygous for an inversion. The non-inverted allele has genes in the following order: A B ● C D E F G H I . The inverted allele has genes in the following order: A B ● C D G F E H I . If a crossover between F and G occurs during meiosis in this individual, which of the following is not a gamete that could be produced from this meiosis? a. A B ● C...