Small body (nb), short spines (Is) and amoral are three recessive traits in stick the genes of which are linked on the same chromosome An heterozygous fish for all these used in a testeross and the following progeny was observed: Number 150 N 120 N 65 Progeny genotype nb ls* a/ nb ls a nb ls at / nb lsa -nb ls' a / nb ls a nb lst a / nb ls a nb ls a/ nb lsa nb ls nb is a nb sa/ nb ls a nb 19a/ nb ls a Progeny phenotype nb'ls a nb ls at nb* 1st at nb lst a Inb ls at nb ls a nb ls* a* nb ls a 200- 68 70 Total 62 578 a. Are the three genes in coupling or in repulsion? Clearly define if in coupling or repulsion for each gene in pairwise combination (e. g., is nb in coupling or repulsion with respect to Is? And with respect to a?, etc. for each gene). nb and is are in coupling nb and is are in repulsion with a?

In a hypothetical breed of dogs, coat color is controlled by two genes. there are six different coat colors in this breed: black, brown, cream, gray, silver, and tan. consider the following crosses. cross 1: black females from a lineage of all black dogs are crossed with brown males from a lineage of all brown dogs. f1 males and females are all black. when f1 are intercrossed, f2 males and females are black or brown. cross 2: black females from a lineage of all black dogs are crossed with tan males from a lineage where all males are tan and all females are cream. f1 males are black, f1 females are gray. when f1 are intercrossed, f2 males and females are black, brown, gray, or tan. cross 3: silver females from a lineage where all females are silver and all males are gray are crossed with brown males from a lineage of all brown dogs. f1 males and females are all gray. when f1 are intercrossed, f2 males are black, brown, gray, or tan, f2 females are cream, gray, silver, or tan. select the correct statements regarding the mode of inheritance of the coat color genes. a) both genes are x-linked. b) both genes are autosomal. c) one of the genes modifies the expression of the other gene. d) each gene has an additive effect on the intensity of coat color. e) each gene independently specifies three colors. f) one of the genes is autosomal, and the other is x-linked.