Genes:

Brown = B
Big eyes = E
Small ears = S
Frizzy hair = F

These 4 phenotypes B, E, S, F are dominant. Recessive alleles = b, e, s, f

Assume that all 4 genes are present on the same chromosome and

1) Be/bE and be/be resulted in 400 Be/bE, 300 be/be, 200 bE/be, and 100 Be/be progeny

2) SF/sf and sf/sf resulted in 200 SF/sf, 100 sf/sf, 400 Sf/sf, and 300 sF/sf progeny

3) Es/eS and es/es resulted in 200 Es/es, 350 es/es, 250 Es/es, and 200 eS/es progeny

List the possible positions of "F" on the chromosome.

Can anyone assist me with this? Readings or how to start would be great. Thank you in advance.

To determine the possible positions of the "F" gene on the chromosome, we can analyze the patterns of inheritance for the different gene combinations in the given scenarios. Let's go through each scenario and examine the results:

1) Be/bE and be/be resulted in 400 Be/bE, 300 be/be, 200 bE/be, and 100 Be/be progeny.

From this scenario, we can infer that the gene for frizzy hair (F) is not linked directly to the other three genes (B, E, S). This is because there is a wide range of different phenotypes observed in the progeny, which suggests independent assortment.

2) SF/sf and sf/sf resulted in 200 SF/sf, 100 sf/sf, 400 Sf/sf, and 300 sF/sf progeny.

Again, from this scenario, we can deduce that the gene for frizzy hair (F) is not directly linked to the gene for small ears (S). The presence of different phenotypes indicates independent assortment.

3) Es/eS and es/es resulted in 200 Es/es, 350 es/es, 250 Es/es, and 200 eS/es progeny.

Similarly, we can conclude that the gene for frizzy hair (F) is also not linked directly to the gene for big eyes (E). The presence of varying phenotypes implies independent assortment.

Based on the results of all three scenarios, we can conclude that the gene for frizzy hair (F) is located independently on the chromosome, not directly linked to any of the other three genes: brown (B), big eyes (E), and small ears (S).

In summary, the possible positions of the "F" gene on the chromosome are not linked with the genes for brown (B), big eyes (E), and small ears (S).