**Zoology and Genetics: Studying Giraffe Traits**As a zoologist focusing on giraffes, you are analyzing specific traits: Grey tongues (G\*), Rudimentary Horns (R\*), and Long necks (L\*). In your research, you conduct a test cross using an individual with recessive versions of all three traits.**Parental Cross:**- Parental Generation (P): G\* R\* L\*/G\* R\* L\* x G R L/G R L**First Filial Generation (F1):**- All identical: G\* R\* L\*/G R L**Results from Test Cross Progeny:**| Progeny Count | Traits ||---------------|-------------------|| 2021 | G R L || 1987 | G\* R\* L\* || 600 | G\* R L\* || 444 | G R\* L || 125 | G R L\* || 122 | G\* R\* L || 7 | G\* R L || 1 | G R\* L\* |**Total Progeny: 5307**(Note: Report averages or ratios to one decimal place if necessary; i.e., 2.3)This table provides an overview of the trait combinations observed in the test cross progeny, helping in understanding the inheritance patterns of these characteristics in giraffes.

Name: **Zoology and Genetics: Studying Giraffe Traits**As a zoologist focus
Uploaded: 2024-03-20T06:43:04.000Z
Channel: Bartleby
Description: **Zoology and Genetics: Studying Giraffe Traits**As a zoologist focusing on giraffes, you are analyzing specific traits: Grey tongues (G\*), Rudimentary Horns (R\*), and Long necks (L\*). In your research, you conduct a test cross using an individua

Introduction :- Three point test cross is used for mapping of gene in which three genes are located and test cross is done between F1 hybrid and recessive parent . In three point test cross , recombinants are formed by crossing over .Single cross over and double cross over occurs separately . Individuals exhibiting same genes as parents have more frequency .Then single crossing over individuals have less than parental frequency .Double crossing over individuals have minimum or least frequency . It is also used to find out order of genesAnswer :- Recombination frequency between R+ and G+ is : (600+444 +7+1)/5307= 0.19 Recombination frequency between G and L: (125+122+7+1)/5307 = 0.04 Explanation :- To find the order of genes , we have to examine products of double cross over. Here double cross over products are:- G+ R L and G R+ L+ In double cross over , different allele are always placed in-between two same alleles . As in G+ R L , G+ is different allele means combination is :- *R* *G+* *L* In case of G R+ L+ ,G is different means combination is :- *R+* *G* *L+* It means that the order of gene will be :- R-----G------L .Explanation (continue..) :- S.C.O :- single cross over and d.C.O : double cross over So, Recombinant frequency between R and G = (individual of s.c.o between R and G ) +d.c.o product / total individuals 1) :- When S.C.O occurs between R and G in R+---G+----L+ and R----G----L then individuals formed are :- R+ G L =444 R G+ L+ =600 And d.C.O products = 7+1 Total individuals = 5307 2) :- When S.C.O occurs between G and L in R+-----G+------L+ and R------G-------L individuals are :- R+ G+ L =122 R G L+=125 D.c.o.=1+7 Total individuals are 5307