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- A geneticist determines that the order of four genes on a specific chromosome is CABD because the recombination frequencies were 35% for C-D, 24% for A-D, 23% for B-D, and 10% for A-B. What has the geneticist constructed? A. a physical map B. a karyotype C. a cytogenic map D. a linkage mapHow would one explain a testcross involving F1 dihybrid flies in which more parental-type offspring than recombinant-type offspring are produced? Group of answer choices A. The testcross was improperly performed B. The two genes are linked C. Both of the characters are controlled by more than one gene D. The two genes are linked but on different chromosomes E. Recombination did not occur in the cell during meiosisThe genes A B C occur in that order in fruit flies. A is 10 mapunits from B, and B is 20 map units from C. If you test crossedtriply heterozygous A B C/abc how much recombinationwould you expect between genes A and B?a) 10%b) 20%c) 30%d) 50%e) 0.2%
- Due to crossing over within an inversion loop, a heterozygotewith a pericentric inversion may produce gametes that carrya. a deletion.b. a duplication.c. a translocation.d. both a deletion and a duplication.Common red clover, Trifolium pratense, is a diploidwith 14 chromosomes per somatic cell. What wouldbe the somatic chromosome number of:a. a trisomic variant of this species?b. a monosomic variant of this species?c. a triploid variant of this species?d. an autotetraploid variant?Karl and Hally Sax crossed Aegilops cylindrica (2 n = 28), a wild grass found in the Mediterranean region, with Triticum vulgare (2 n = 42), a type of wheat . The resulting F1 plants from this cross had 35 chromosomes. Examination of metaphase I in the F1 plants revealed the presence of 7 pairs of chromosomes (bivalents) and 21 unpaired chromosomes (univalents). a. What does the appearance of the bivalents in the F1 hybrids suggest about the origin of Triticum vulgare wheat?
- A diploid species with 44 chromosomes (i.e., 22 per set) is crossedto another diploid species with 38 chromosomes (i.e., 19 per set).Define key terms. Make a calculation. Predict the outcome.During the molecular process of homologous recombinationbetween homologous chromosomes,a. a Holliday junction forms.b. branch migration occurs.c. a heteroduplex region forms.d. all of the above occur.. The numbers of chromosomes in the somatic cells ofseveral oat varieties (Avena species) are: sand oats(Avena strigosa)—14; slender wild oats (Avenabarata)—28; and cultivated oats (Avena sativa)—42.a. What is the basic chromosome number (x) in Avena?b. What is the ploidy for each of the different species?c. What is the number of chromosomes in the gametesproduced by each of these oat varieties?d. What is the n number of chromosomes in eachspecies?
- In a species of firefly, wide wings (W) are dominant to narrow wings (w) and graybodies (C) are dominant to brown bodies (c). A WwCc and wwcc fly were mated andproduced the following offspring: (in the picture attached) What is the recombination frequency for this cross (in percent)?Create a chromosome map for each set of three genes from the given information. b) the crossover frequency between gene X and gene Z is 8.5 %, the crossover frequency between gene Y and gene Z is 2.25 % and between gene Y and gene X is 6.25 %In an autotetraploid Chinese primrose (Primula sinensis L.), the gene controlling stigma color is very near the centromere of the chromosome carrying it. The allele G for green stigma is dominant to g for red stigmas. A homozygous green autotetraploid strain is crossed with a homozygous red autotetraploid strain. Show all solutions and label solutions and final answers properly. a. What is the genotype of the F1? b. Derive the types of gametes the F1’s may be expected to form and the proportion of each. c. What are the expected genotypic ratio, and phenotypic ratio of green to red if: i. the F1’s are intercrossed? ii. the F1’s are crossed with red plants? d. If the G locus were 50 or more map units from the centromere, what types and proportions of gametes would the F1 be expected to produce? Derive the expected F2 genotypic and phenotypic ratios Answer letter D only. please, thank you!