Human Anatomy & Physiology (11th Edition)
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ISBN: 9780134580999
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
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To build a genetic map, how many types of crosses will be required to perform if you have three genes to map? Explain.
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- Can you explain genetic map with two point cross? And show me a example with the crossarrow_forwardSuppose researchers studied the first chromosome of a new species and mapped three genes of interest, indicated as a, b, and c. A three‑factor cross was performed and the number of gametes formed from the F2 generation was recorded in a table. Note that the order of genes in the table is arbitrary. Calculate the recombination frequencies for each given gene pair in map units. a+ b+ c+ a b c a b+ c+ a+ b c a b+ c a+ b c+ a b c+ a+ b+ c 173 176 35 33 11 10 3 1 After completing the gene mapping, the researchers treated individuals to induce inversions in the chromosomes. After treatment, another three‑factor cross was performed and the number of gametes formed from the F2 generation was recorded in a second table. Note that the order of genes in the table is arbitrary. a+ b+ c+ abc a b+ c+ ?+ b c a b+ c a+ b c+ a b c+ a+ b+ c 188 185 24 26 1 0 49 46 Calculate the recombination frequencies for each given gene pair in map units.arrow_forwardThe A locus and the D locus are so tightly linked that norecombination is ever observed between them. If Ad/Ad is crossed with aD/aD and the F1 is intercrossed,what phenotypes will be seen in the F2 and in whatproportions?arrow_forward
- A cross was made between 2 Drosophila that have the wild phenotype. Their progenies were found to have the same phenotype. A sample was taken from 2000 progenies, each of which was crossed with a fly having purple eye color. Half of the cross gave only wild type flies and the other half gave 50% purple-eyed progeny. What were the genotypes of the original pairs of wild type flies?arrow_forwardYou would like to create new hybrid strains between various cereal grains of different ploidies. Which of the following crosses will yield a fertile hybrid? Select all correct answers. (note that tri=3, tetra=4, penta=5, hexa= 6, and octa=8) 0 0 0 0 pentaploid X triploid tetraploid X diploid octaploid X diploid hexaploid X diploidarrow_forwardIn an attempt to breed winter barley that is resistant to barley mosaic virus, agricultural researchers cross a susceptible domesticated strain with a resistant wild strain. The F1 plants are all susceptible, but when the F1 plants are crossed with each other, some of the F2 individuals are resistant. Is the resistance allele recessive or dominant? (Note: susceptible means able to get the viral disease, while resistant means not able to get the disease) A) The resistance allele must be recessive B) The resistance allele must be dominantarrow_forward
- Explain the term out-crossing.arrow_forwardWhy are some crosses not performed in a complementation matrix?arrow_forwardAs a graduate student, you join a lab and you are looking through some old notebooks. You find a linkage map someone has drawn. G--15 mu-----T----10 mu-------B If you plan to complete a test cross with a GtB/gTb male, A) What are all of the expected progeny genotypes? B.) How many of each genotype would you expect if you collected 1000 progeny?arrow_forward
- In which kind of cross would you expect to find a ratio of 9:3:3:1 among the F2 spring A) Monohybrid crossB) None of these choices is correctC) testcrossD) Dihybrid crossarrow_forwardCan you explain a genetic map with the three point testcrossarrow_forwardIf two genes are unlinked the recombination frequency will be? 25% 50% 75% 100%arrow_forward
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