The right answer is A rapid temperature increase will give a melting point range that is too high.
The melting point is determined in a capillary tube. it means the temperature at which the substance is completely melted, indicated by the disappearance of the solid, will not differ by ± 4 ° C from the given value, unless otherwise indicated.
The following technique can be applied to determine the melting point:
Grind some amount of substance in a small mortar. Place in a vacuum desiccator containing silica gel or phosphorus pentoxide and allow to dry for 24 hours at room temperature (unless another method of drying is indicated in the test protocol) . Introduce the substance into a dry capillary tube 1 mm inside diameter to form a column about 3 mm high. Heat the melting device to a temperature 5 to 10 ° C below the expected melting temperature and adjust the heating so that the temperature of the enclosure rises by approximately 1 ° C per minute. Introduce the capillary tube containing the substance into the heated chamber and note the temperature at which the agglomerated substance becomes completely transparent; this temperature constitutes the melting point.
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Answer:
10 (agouti) : 3 (black) : 3 (white)
Explanation:
Genotype AaBb can produce gametes AB, Ab, aB, ab.
The cross between Aa Bb × Aa Bb:
The phenotype ratio is 10 (agouti) : 3 (black) : 3 (white)
Genotypes for the agouti phenotype are: AABB, AABb, AaBB, AaBb
Genotypes for the black phenotype are: AAbb and Aabb
Genotypes for the white phenotype are: aaBB, aaBb and aabb
