| 单词 | heterozygote |
| 例句 | Figure 8.8 A test cross can be performed to determine whether an organism expressing a dominant trait is a homozygote or a heterozygote. Concepts of Biology 2013-04-25T00:00:00Z Figure 12.5 A test cross can be performed to determine whether an organism expressing a dominant trait is a homozygote or a heterozygote. Biology for AP Courses 2022-06-09T00:00:00Z In time, students discover that one is homozygous green and the other a yellow-blue heterozygote. [Essay] IBI* Series Winner: Aipotu: Simulation from Nucleotides to Populations and Back Again 2012-07-26T17:55:45.303Z A heterozygote in which dominance prevails can be identified with certainty by breeding to a known recessive and noting the kind of offspring produced. Being Well-Born An Introduction to Eugenics 2012-05-22T15:16:53.140Z The heterozygote produced by crossing these forms is intermediate in size and appearance. Mendelism Third Edition Mendel’s law of dominance states that in a heterozygote, one trait will conceal the presence of another trait for the same characteristic. Concepts of Biology 2013-04-25T00:00:00Z However, the heterozygote phenotype occasionally does appear to be intermediate between the two parents. Biology for AP Courses 2022-06-09T00:00:00Z An individual may be a homozygote with respect to one factor and a heterozygote with respect to another. Applied Eugenics 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. Hormones and Heredity Individuals with mutations that result in dominant lethal alleles fail to survive even in the heterozygote form. Biology for AP Courses 2022-06-09T00:00:00Z Coat color depends on the A gene, which shows dominance, with the recessive homozygote showing a different phenotype than the heterozygote or dominant homozygote. Concepts of Biology 2013-04-25T00:00:00Z In this case, the mutant allele expands the distribution of the gene product, and as a result, the Antennapedia heterozygote develops legs on its head where its antennae should be. Biology for AP Courses 2022-06-09T00:00:00Z Thus, there are four equally likely gametes that can be formed when the YyRr heterozygote is self-crossed, as follows: YR, Yr, yR, and yr. Biology for AP Courses 2022-06-09T00:00:00Z 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. Hormones and Heredity However, the results of a heterozygote self-cross can still be predicted, just as with Mendelian dominant and recessive crosses. Biology for AP Courses 2022-06-09T00:00:00Z This pattern of inheritance is described as incomplete dominance, meaning that one of the alleles appears in the phenotype in the heterozygote, but not to the exclusion of the other, which can also be seen. Concepts of Biology 2013-04-25T00:00:00Z For instance, the recessive lethal Curly allele in Drosophila affects wing shape in the heterozygote form but is lethal in the homozygote. Biology for AP Courses 2022-06-09T00:00:00Z This hierarchy, or allelic series, was revealed by observing the phenotypes of each possible heterozygote offspring. Biology for AP Courses 2022-06-09T00:00:00Z The two segregate in the gametes of the hybrid or heterozygote, and if a recessive gamete is fertilised by another recessive gamete the single comb reappears. Hormones and Heredity This may occur when the mutant allele somehow interferes with the genetic message so that even a heterozygote with one wild-type allele copy expresses the mutant phenotype. Biology for AP Courses 2022-06-09T00:00:00Z Incomplete dominance describes situations in which the heterozygote exhibits a phenotype that is intermediate between the homozygous phenotypes. Biology for AP Courses 2022-06-09T00:00:00Z When one homologous chromosome undergoes an inversion but the other does not, the individual is described as an inversion heterozygote. Biology for AP Courses 2022-06-09T00:00:00Z An inheritance pattern in which an allele is only lethal in the homozygous form and in which the heterozygote may be normal or have some altered non-lethal phenotype is referred to as recessive lethal. Biology for AP Courses 2022-06-09T00:00:00Z When the latter occurs there would be no segregation and the heterozygote would breed true. Hormones and Heredity The probability of a homozygous dominant at A is 1/4 and the probability of a heterozygote at A is 1/2. Biology for AP Courses 2022-06-09T00:00:00Z The probability of the homozygote or the heterozygote is 1/4 + 1/2 = 3/4 using the sum rule. Biology for AP Courses 2022-06-09T00:00:00Z The dominant lethal inheritance pattern is one in which an allele is lethal both in the homozygote and the heterozygote; this allele can only be transmitted if the lethality phenotype occurs after reproductive age. Biology for AP Courses 2022-06-09T00:00:00Z The heterozygote individual in typical cases shows the dominant character. Hormones and Heredity If a heterozygote is bred with a pure recessive the offspring are half heterozygote and half recessive. Hormones and Heredity It would seem, therefore, that the pile is the heterozygote of black-red and 'dominant' white. Hormones and Heredity The gametes they produce are D+d and d+d, and the fertilisations are therefore Dd, Dd, dd, dd, or heterozygote dominants and pure recessives in equal numbers. Hormones and Heredity |
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