a.
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.
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.
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.
To determine:
The expected result from a cross between homozygous redfish and homozygous blue fish and the
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).
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Chapter 5 Solutions
Genetics: A Conceptual Approach
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- With reference to their absorption spectra of the oxy haemoglobin intact line) and deoxyhemoglobin (broken line) shown in Figure 2 below, how would you best explain the reason why there are differences in the major peaks of the spectra? Figure 2. SPECTRA OF OXYGENATED AND DEOXYGENATED HAEMOGLOBIN OBTAINED WITH THE RECORDING SPECTROPHOTOMETER 1.4 Abs < 0.8 06 0.4 400 420 440 460 480 500 520 540 560 580 600 nm 1. The difference in the spectra is due to a pH change in the deoxy-haemoglobin due to uptake of CO2- 2. There is more oxygen-carrying plasma in the oxy-haemoglobin sample. 3. The change in Mr due to oxygen binding causes the oxy haemoglobin to have a higher absorbance peak. 4. Oxy-haemoglobin is contaminated by carbaminohemoglobin, and therefore has a higher absorbance peak 5. Oxy-haemoglobin absorbs more light of blue wavelengths and less of red wavelengths than deoxy-haemoglobinarrow_forwardWhich ONE of the following is FALSE regarding haemoglobin? It has two alpha subunits and two beta subunits. The subunits are joined by disulphide bonds. Each subunit covalently binds a haem group. Conformational change in one subunit can be transmitted to another. There are many variant ("mutant") forms of haemoglobin that are not harmful.arrow_forwardWhich ONE of the following is FALSE regarding haemoglobin? It has two alpha subunits and two beta subunits. The subunits are joined by disulphide bonds. Each subunit covalently binds a haem group. Conformational change in one subunit can be transmitted to another. There are many variant ("mutant") forms of haemoglobin that are not harmful.arrow_forward
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