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Answers
Answer:
test cross means
Explanation:
kisi subject ka test dena
Answer:
The test cross is an experiment first employed by Gregor Mendel, in his studies of the genetics of traits in pea plants. Mendel’s theory, which holds true today, was that each organism carried two copies of each trait. One was dominant trait, while one could be considered recessive. The dominant trait, if present, would determine the outward appearance of the organism, or the phenotype. Thus, Mendel became interested in the question of determining which organisms with the dominant phenotype had two dominant alleles, and which have one dominant allele and one recessive allele. His answer came in the form of the test cross.
The purpose of the test cross is to determine the genetic makeup of the dominant organism. Mendel wanted to do this so that he could be sure he was working with a dominant organism which was homozygous, or contained only dominant alleles. However, the phenotype alone doesn’t not tell you the genotype of an organism. The organism could be hiding a recessive, non-expressed allele. To find out what this unknown allele was, Mendel developed the technique of breeding this individual with a homozygous recessive individual for the same trait.
Explanation:
The typical example of the test cross is the origin experiment Mendel conducted himself, to determine the genotype of a yellow pea. As seen in the image below, the alleles Y and y are used for the yellow and green versions of the allele, respectively. The yellow allele, Y, is dominant over the y allele. Therefore, in an organism with the genotype Yy, only the yellow allele is seen in the phenotype. Mendel had a yellow pea, and he wanted to know whether it was YY or Yy.