7.18 In Drosophila, the genes st (scarlet eyes), ss (spineless bris- tles), and e (ebony body) are located on chromosome 3, with map positions as indicated: SS e 58 70 st 44 Each of these mutations is recessive to its wild-type allele (st, dark red eyes; sst, smooth bristles; et, gray body). Phenotypically wild-type females with the genotype st ss et/st st sste were crossed with triply recessive males. Predict the phenotypes of the progeny and the frequen- cies with which they will occur assuming (a) no interfer- ence and (b) complete interference.

In Drosophila, a cross (cross 1) was made between twomutant flies, one homozygous for the recessive mutationbent wing (b) and the other homozygous for the recessivemutation eyeless (e). The mutations e and b are alleles oftwo different genes that are known to be very closelylinked on the tiny autosomal chromosome 4. All the progeny had a wild-type phenotype. One of the female progeny was crossed with a male of genotype b e/b e ; we willcall this cross 2. Most of the progeny of cross 2 were of theexpected types, but there was also one rare female ofwild-type phenotype.a. Explain what the common progeny are expected tobe from cross 2.b. Could the rare wild-type female have arisen by (1)crossing over or (2) nondisjunction? Explain.

Given the following alleles that control the traits of Drosophila melanogaster:R = red eyes L = long wings B = brown bodyr = sepia eyes l = vestigial wings b = black body A testcross between a triple heterozygous parent and a recessive parent revealed the followingexpressed alleles: 55 sepia long brown 8 sepial long black187 sepia vestigial black 1 sepia vestigial brown43 red vestigial black 196 red long brown2 red long black 9 red vestigial brown Determine the order of the loci and the distance between them in centimorgan (cM). Construct agene map to show your results. Show COMPLETE solution.

Rice has a chromosome number of 2n = 24.  If different euploids and aneuploids are available in rice,  identify the chromosomal mutation, chromosome configuration, chromosome number, and/or type of gametes in each of the mutations below. Example: For 10B, the answer is  “10 II + 2 I”

Below is shown an annotation indicating the protein coding genes of a Drosophila genomic region. Below this map is shown the structure of an inversion (the vertical lines indicate the breakpoints), three deletions (indicated by the gaps) and three Insertions (indicated by the triangles) 100 S עולם Sara N Deletion Insortion Insertion 2 13829 Inversion 1 Execst PART Deletion? Deletion 3 Insertion 3 You have a mutation in a gene required for the development of the wings. Drosophila homozygous for this mutation have no wings. You cross these Drosophila homozygous for the wingless mutant allele with Drosophila homozygous for the seven mapped DNA changes. Mapped change Phenotype Inversion 1 wingless Deletion 1 wingless Deletion 2 wild type Deletion 3 wild type Insertion 1 wild type Insertion 2 wingless Insertion 3 wild type You conclude that the mutated allele is in which of the below genes? hh unk Irk1 CG46310 cnc Ⓒfzo CG4467 Rad60 EloA wda Pex11c orb

Which Position-effect variegation in Drosophila?

6.5 Distinguish between cis and trans allele arrangements.

6.4 Write genotypes correctly to indicate if two genes are linked or not and if linked, the arrangement of the alleles on homologues.

Cat fur coat color genetics is interesting. Orange fur is dominant (''B'') to black fur (''b'') and piebald, which is white spotting, is dominant (''S'') to non-white-spotted (''s''). Both of those genes are located on the X chromosome. In addition, in cats, somatic cells exhibit X-inactivation randomly, which explains why there are tortoiseshell cats (when heterozygous, have orange and black spots) as well as calico cats (orange and black but also with white spots). An orange and white spotted male is mated with a tortoiseshell female. State the genotype of the male and the female.

In Drosophila, the genes st (scarlet eyes), ss (spineless bris- tles), and e (ebony body) are located on chromosome 3, with map positions as indicated: st SS e 44 58 70 Each of these mutations is recessive to its wild-type allele (st*, dark red eyes; ss*, smooth bristles; e*, gray body). Phenotypically wild-type females with the genotype st ss e*/st* st* ss+ e were crossed with triply recessive males. Predict the phenotypes of the progeny and the frequen- cies with which they will occur assuming (a) no interfer- ence and (b) complete interference.