Chapter 5.2, Problem 26AQP

a.

Summary Introduction

To determine:

The genotype of back cross progeny from a homozygous brown fish with a homozygous white fish, and backcrossed the F₁ with the homozygous white parent.

Introduction:

Medaka is a small fish, which is found in Japan. The fish are of four colors; red, blue, brown, and white. The color of the fish is determined by the genes at two loci; B, b, and R, r. Brown color is determined by two dominant loci (B_R_), blue color of the fish is determined by one dominant allele (B_rr), red color of the fish is determined by only one dominant allele at the R locus (bbR_), and white color is determined by a recessive allele at both locus (bb rr).

b.

Summary Introduction

To compare:

The observed numbers of back cross progeny with the number expected progeny, by using a chi-square test, also to conclude the result of chi-square test.

Introduction:

Medaka is a small fish, which is found in Japan. The fish are of four colors; red, blue, brown and white. The color of fish is determined by the genes at two loci; B, b and R, r.

Brown color is determined by two dominant loci (B_R_), blue color of the fish is determined by one dominant allele (B_rr), red color of the fish is determined by only one dominant allele at R locus (bbR), and white color is determined by recessive allele at both locus (bb rr).

c.

Summary Introduction

To determine:

The result which is expected in a cross between homozygous red and homozygous white fish.

Introduction:

Medaka is a small fish which is found in Japan. The fish are of for colors; red, blue, brown and white. The color of fish is determined by the genes at two loci; B, b and R, r.

Brown color is determined by two dominant loci (B_R_), blue color of the fish is determined by one dominant allele (B_rr), red color of the fish is determined by only one dominant allele at R locus (bbR_) , and white color is determined by recessive allele at both locus (bb rr).

d.

Summary Introduction

To determine:

The expected result from a cross between homozygous redfish and homozygous blue fish and the $F_1$ progeny are again backcrossed with a homozygous red parental fish.

Introduction:

Medaka is a small fish which is found in Japan. The fish are of for colors; red, blue, brown and white. The color of fish is determined by the genes at two loci; B, b and R, r.

Brown color is determined by two dominant loci (B_R_), blue color of the fish is determined by one dominant allele (B_rr), red color of the fish is determined by only one dominant allele at R locus (bbR_) , and white color is determined by recessive allele at both locus (bb rr).