Indicate whether each of the following statements about genetic recombination is
ID: 47780 • Letter: I
Question
Indicate whether each of the following statements about genetic recombination is true or false.
01. The independent assortment of traits that Mendel observed during his dihybrid crosses is due to crossing over and the independent assortment of chromosomes during meiosis. TrueFalse
02. Crossing over involves the physical exchange of genetic material between homologous chromosomes during Prophase I of meiosis. TrueFalse
03. If an odd number of crossovers (1, 3, 5, etc.) occurs between two gene loci, it leads to the production of chromosomes that are recombinant for those two loci; if no crossovers or an even number of crossovers (2, 4, 6, etc.) occur, then the chromosomes will carry the original parental combination of alleles. TrueFalse
04. As the physical distance separating two gene loci increases, the probability that crossing over will occur between them decreases. TrueFalse
05. If two gene loci are located on the same chromosome, then chromosomes that are recombinant for these two loci will be produced if an odd number of crossovers occur anywhere along the length of the chromosome. TrueFalse
06. When gene loci are close together on the same chromosome, the number of recombinant progeny is higher than the number of parental progeny, and the genes are said to be linked. TrueFalse
07. Recombination frequency equals the number of recombinant progeny divided by the number of parental progeny. TrueFalse
08. The distance between two linked gene loci can be determined by crossing doubly heterozygous individuals with individuals who are homozygous for both dominant alleles and then counting progeny to determine the percent recombination. TrueFalse
09. When constructing genetic maps, each 1% of recombination is equal to a distance of 1 map unit or 1 cM. TrueFalse
10. As the distance between two gene loci increases, the frequency of multiple crossovers between the two loci also increases. TrueFalse
11. In order for two gene loci to assort independently, they must be located on different chromosomes. TrueFalse
12. Because multiple crossovers do not always produce recombinant progeny, longer map distances are more accurate than shorter map distances.
Explanation / Answer
1. FALSE
2. TRUE
3. TRUE
4. FALSE
5. TRUE
6. FALSE
7. FALSE
8. TRUE
9. TRUE
10. TRUE
11. TRUE
12. FALSE