If the reaction to continued growth of the fold is strong in one race and weak in the other, then in the heterozygotethat reaction, whatever its nature, is reduced.
In this character, then, dominance almost always fails to show itself in the heterozygote and often fails in pure dominants.
It now remains to test our conclusions by reference to the mating of the heterozygote with the dominant and with the recessive types, respectively.
The normal foot, though commonly recessive, may sometimes dominate over the extra-toe character, and this heterozygote may give equality when bred with recessives, just as if it were an ordinary DR.
When in the parents dominance has been very incomplete in the heterozygote (as is the case in the 0 per cent to 40 per cent median-combed parents) we find it so in the offspring also and all heterozygotes show a Y comb of some type.
On crossing the rose with the pea union occurs between a gamete Rp and a gamete rP, resulting in the formation of a heterozygote of the constitution RrPp.
If the given factor is brought in by one gamete only, the resulting heterozygote may be more or less intermediate between the homozygous form with a double dose of the factor and the homozygous form which is entirely destitute of the factor.
The heterozygote produced by crossing these forms is intermediate in size and appearance.
If the mutation were due to the loss of one factor affecting the eye, the heterozygote carrying the normal factor from the mother only might very well develop a somewhat imperfect eye.
If a heterozygote is bred with a pure recessive the offspring are half heterozygote and half recessive.
When the latter occurs there would be no segregation and the heterozygote would breed true.
It would seem, therefore, that the pile is the heterozygote of black-red and 'dominant' white.
The heterozygote individual in typical cases shows the dominant character.
Since the heterozygote in F1 was deeply pigmented, it is certain that a bird with only a small amount of pigment in its skin was a recessive resulting from incomplete segregation of the pigmented character.
The condition bred true, as pure recessives do; and when such an impure recessive was mated with a heterozygote with black skin, the offspring were half pigmented and half recessive, with some pigment on the abdomen of the latter.
In Mendelian experiments, a heterozygote individual is one arising from gametes containing opposite members of a pair of characters, in other words, from the union of a gamete carrying a dominant with another carrying a recessive.
Where there is no definite dominance and the heterozygote is of an intermediate nature we should be unable to declare on which side the factor concerned was present and from which side it was absent.
If A and B are two factors which exhibit these phenomena we find that the gametic series of the double heterozygote differs according as the combination is made by crossing AB x ab, or by crossing AB x aB.
The formula for the F{1} heterozygote was therefore BbB'b'.
A heterozygote in which dominance prevails can be identified with certainty by breeding to a known recessive and noting the kind of offspring produced.
An individual may be a homozygote with respect to one factor and a heterozygote with respect to another.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "heterozygote" in a variety of sentences. We hope that you will now be able to make sentences using this word.
