A certain species of rabbit can have either black or grey fur. The allele for black fur is dominant over the allele for grey fur
. If a homozygous black rabbit is crossed with a heterozygous black rabbit, what phenotypic ratio will occur in the first generation?
A.
50% black : 50% grey
B.
100% black : 0% grey
C.
75% black : 25% grey
D.
25% black : 75
A.
50% black : 50% grey
B.
100% black : 0% grey
C.
75% black : 25% grey
D.
25% black : 75
2 answers:
The answer is; B
If we assume that the allele for black fur is B and that for white fur is b, crossing a homozygous black rabbit with a heterozygous black rabbit, will yield the following results (indicated in the punnet square below);
Genotypically, 50% of the population will be homozygous dominant, while 50% will be heterozygous. However, phenotypically, all offspring will bear black fur because the black fur allele is dominant over the grey allele.
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Explanation:
In physical quantities, the resistance of an electrical conductor can be correlated directly with the temperature of the material. The property for the change in the resistance with temperature is called the temperature coefficient of resistance. Mathematically, the resistance of a material is given as follows:
where R = conductor resistance at the temperature T.
Rreff = the conductor resistance at the reference temperature,
= temperature coefficient of resistance
T = Conductor temperature
Treff = reference temperature of the material.
From the equation, it can be seen that a positive coefficient for a material means an increase in the resistance of the material.
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