The progeny of a Drosophila female (heterozygous at three loci, y+y, ct+ct, w+w)

Question

The progeny of a Drosophila female (heterozygous at three loci, y+y, ct+ct, w+w) crossed to a wildtype male are listed as follows:

a. On which chromosome do these genes reside?

b. What is the gene order and gene arrangement in the trihybrid female parent?

8. In tomato the genes for jointless (j), hairless (hl) and leafy (lf) are known to be linked on chromosome 5. Plants heterozygous for these three gene pairs, j+j hl+hl lf+lf were test crossed and the progeny listed:

a. What is the correct sequence of genes in the linkage group?

b. What is the correct linkage phase of the trihybrid parent?

PLEASE SHOW WORK I HAVE TO UNDERSTAND HOW TO DO THIS PLEASE!

Explanation / Answer

a. On which chromosome do these genes reside?

X chromosome

b. What is the gene order and gene arrangement in the trihybrid female parent?

y+ ct, y ct +   15+16+3+1 = 35/2000x100=1.75 mu

y+ w, w+ y      773+782+3+1 = 1559/2000x100 =77.95 mu ( RF = more than 50%) w+ is present in different chromosome

y+ ______ ct+          w+    ______

a. What is the correct sequence of genes in the linkage group?

j hl+, j+ hl   = 142+139+9+1 = 291/500x100 = 58.2

j lf+   j+ lf    = 142+9+10+96+1 =258/500x100 = 51.6

j ______lf_______hl is the gene arrangement

All the genes are not in phase ie present on different chromosomes

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.