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2. A maize plant heterozygous for three genes is crossed in a test cross. Are obtained the following results:
Progeny
ABC 304
abc 301
Abc 35
aBC 33
ABc 8
abC 6
AbC 172
aBc 169
A. Determine the order and distance of the genes
b. Determine the coefficient of coincidence and the interference.
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- 3. In the test cross r/+ s/+ w/+ z/+ rswz/rswz, the following offspring are obtained: X Phenotype r st w+ z r stw z Number 359 47 4 rs w z+ rs w+z+ 98 rt st w z 92 r+ s w z+ 351 r+ st w+ z 6 r+s w+ z+ a) Construct a map of the genes showing their relative distance apart. 43 b) Is there any interference in this region? Note: the listed gene order is arbitrary. Can you deduce the proper order by inspection?1. In a cross between mice the genotypes AB/ab x ab/ab, what is the recombination frequency if the progeny numbers are 72 AB/ab, 68 ab/ab, 17 Ab/ab, and 21 aB/ab? The alleles are shown for each chromosome, separated by a slash (/). . 2. A cross between fruit files with genotypes Aa Bb × aa bb produces the following progeny: 10 Aa Bb 40 Aa bb 40 aa Bb 10 aa bb Were the parental alleles in the coupling or repulsion configuration? Briefly explain. 3. Briefly describe how twin studies can reveal whether or not the appearance of a trait is strongly influenced by genetics.2. The homozygous mutant a, an allele of the albinism gene in the mouse, has a white coat and dark eyes. The homozygous mutant p has pink eyes. Mice of genotype a+/+p are testcrossed with mice homozygous for the two mutations. The progeny obtained are shown below. Calculate the recombination frequency and map distance between the two genes. Phenotype of Progeny White coat, dark eyes White coat, pink eyes Dark coat, white eyes Dark coat, pink eyes Number 240 31 34 474
- 8. Kernel color in wheat is controlled by 2 pairs of genes (AABB). Determine the color of the offspring with the following genotypes: (Note: 4 contributing alleles – red; 3 contributing alleles – medium red; 2 contributing alleles – intermediate red; 1 contributing allele – red; and 0 – white AAbb x AaBb AABb x Aabb aaBb x Aabb AABb x aabb AABb x AaBb A wheat plant producing medium red seed is crossed with another plant producing intermediate red seed (refer to problem no. 8). How many individuals will be? Red Medium red Intermediate red Light red White11. Shown below are the offspring of the testcross qr/q +r+ X q r/q r. Which groups are in the recombinant class? q+r and qr+ q+r+ and qr+ qr and qr+ q+r+ and qr1. The allele G for yellow stigma is completely dominant to green (g). Supposingtwo strains of autotetraploid plants are available and their genotypes are as follows:GGgg – in this plant the gene is close to the centromereGggg – in this plant the gene is far from the centromere If these two plants are crossed:a) provide the gametes that can be obtained from the two plants;b) provide the genotypic and phenotypic ratios of the offspring. 2. Consider the illustration below. Diagram the configuration you would observe at Anaphase I if crossing-over happens within the inversion. (IMAGE ATTACHED)
- 1. In maize, the following genes are linked on chromosome 3: va - variable sterile v - virescent gl - glossy leaves Two homozygous plants were crossed and produced an all normal F1. When the F1 was test-crossed, progeny phenotypes appeared as follows: 235 virescent 7.glossy 60 wild 40 variable sterile 270 variable sterile, glossy 62 variable sterile, virescent, glossy Diagram the chromosome map for the 3 loci Example: a--1.00 cM--b--2.00 CM--c--3.00 CM Significant # of decimal places for answer: 2 Answer: 48 virescent, glossy 4 variable sterile, virescent 2. Two hypothetical autosomal human genes are 10 cM apart. These dominant alleles are completely penetrant and respectively cause crossed eyes (e+) and small thumbs (th+). A cross-eyed, small thumbed woman marries a normal man and they have 4 children. Two of the children are cross-eyed and two of the children have small thumbs. The woman is pregnant with a 5th What is the probability that this child will be cross-eyed and have small…A 3-point test cross produces the following numbers of offspring: The yellow cells are the recombinant + + a 348 offspring that result from a single cross-over between A & G. What is the distance g x + 363 between those two genes? + X + 88 O 18.8 mu g + a 96 O 89.5 mu g + 61 O cannot be determined from the information given + X a 40 89.9 mu g x a 1 O 18.4 mu + + + 3.2. The height of a wheat plant is determined by several genes. In a variety the minimum size is 12 inches and the maximum is 24 inches. 12-inch plants were crossed with 18-inch plants, and produced an 18-inch F1. The F1 was allowed to cross each other, and an F2 was obtained in which the 12 and 24 inch plants were obtained with a frequency of 2/8195. How much does each ALELO contribute to the size of the plant? Select one: a. 3 inchesb. 2 inchesc. 1 inch
- Consider the following Test Cross results & chromosome map: Test Cross Progeny 525 A B C 500 A+ B+C+ 456 A+ B C 308 A B+C+ 101 A B C+ 100 A+ B+C 2 A+ B C+ 1 A B+C Total Progeny = 1993 1-Calculate the interference.?31 1. In guinea pig, fur color is determined by one gene, and fur length by another independently segregating gene. The black fur allele (B) is dominant to brown fur allele (b) and the short allele (S) is dominant to long fur allele (s). From progeny listed in the following table, provide the probable genotype for the parents of each cross. Phenotype of Progeny Black short black long brown short Bio3110 Genetics Additional problems (Chapter 2): Parents Black short X Black short Black short X Brown long Black long X Black long 90 17 0 32 16 35 29 14 0 brown long 8 15 2. A mouse with the genotype BbccEeFf is mated with another mouse with BBCcEEFF genotype. What is the probability of obtaining the following genotype in the progeny? a. BBCcEeFF b. BbccEEFf C. BbccEeFF 12 3. Determine the type of gametes that are formed from the following individuals with the given genotype? A. AaBbCc B. AABBCc C. AABbCc1. The height of a wheat plant is determined by several genes. In a variety the minimum size is 12 inches and the maximum is 24 inches. 12-inch plants were crossed with 18-inch plants, and produced an 18-inch F1. The F1 was allowed to cross each other, and an F2 was obtained in which the 12 and 24 inch plants were obtained with a frequency of 2/8195. How many genes are involved in determining plant size in this variety of wheat? Select one: a. 5b. 6c. 4d. 3
