When does the recessive trait show in an organism?

Answer 1

In experimental organisms, the study of two characters simultaneously is called a dihybrid cross. An organism with the recessive phenotype for both is called a double recessive organism.Recessive traits may result from genes carried on the X chromosome.The concept of dominance and recessivity is an operational one, and the distinction is not absolute. in human genetics, a trait may be undetectable in "carriers" and thus defined as recessive .Genetic selection acts on the phenotype of an individual. Carriers of recessive traits, , are not detectable phenotypically, will not be selected against, and can, therefore, harbor and transmit their recessive alleles throughout generations

Answer 2

A recent study has shown that r-DNA has an enormous role in gene expression in offspring. This can cause recessive genes to be transcribed more than dominant ones based on the amount of this non-nucleic material present. r-DNA levels change based on an organism's experience. What this means is that the genetic outcome can be affected by the parents behavior and experience. This is the best case for an evolution mechanism, because natural selection couldn't explain the whole process. Also, many genes are viral inserts, that is they came outside the organism's lineage. One study says that without this viral insert, Placental Mammals can't reproduce! This study came about as an accident after the Researchers had removed a gene from plant DNA, but it still expressed itself in the offspring. Searching for the problem, they found the answer in the r-DNA.

So as it turns out, The recessive gene doesn't have to come from both parents, and can even skip generations.

Answer 3

Recessive traits can be determined by analyzing dna code. A recessive trait shows in the offspring of two parents with the same recessive trait, thereby creating that trait as dominant in the child.

Answer 4

The recessive trait only shows when the organism doesn't have a copy of the dominant form of the gene.

Answer 5

There are three genotypes, or combinations of genes: homozygous dominant, which mean you have two dominant genes (AA), homozygous recessive, which means you have two recessive genes (aa), and heterozygous, which means you have one dominant and one recessive (Aa). The recessive form of a gene appears in the organism's physical makeup when there is no dominant gene to overpower it. Whenever there's a dominant, it is the form that shows, it completely overtakes the recessive. The recessive trait is then only able to be exhibited when you are homozygous recessive for the gene. Hope this helps!

Answer 6

Mendel was a guy who grew a lot of plants, as I recall. He grew, among other things, pea plants, and he noticed that some peas were wrinkly, while others were round. Upon further analysis, he discovered that some plants would always breed wrinkly, while others would breed round. As an experiment, he tried crossbreeding the different plants. In the first generation, all the peas were round. In the second generation, however, if Mendel allowed them to self-pollinate, they created 3 round ones for every wrinkly one. Mendel hypothesized that each parent provides one set of instructions, or an allele, for each trait. true breeding round ones provided round alleles; true breeding wrinkly ones provided wrinkly alleles. If a plant was cross-bred, it could provide either allele. So if both parents were cross-bred, then either Mom and Dad gave round alleles, Mom gave round and Dad gave wrinkly, Dad gave round and dad gave wrinkly, or they both gave wrinkly. So there were 4 possible commands. Mendel said that the round trait was dominant; any time it was present, the pea would be round. The wrinkly trait was recessive; it only showed up when the dominant trait was not in place. Therefore, of the 4 possible combinations of alleles, only one lacked the dominant trait, so only one showed the recessive trait. Thus, the recessive trait is present when the dominant trait is not.

Answer 7

when there is no dominant trait to counteract it - the dominant gene is absent or damaged to the point where it can't express, or something in the environment prevents expression of the dominant gene - haploid organisms (organisms with only one copy of each chromosome) which have the recessive gene will epxress the recessive trait.

Answer 8

When two alleles(?) - one from each parent - coding for that recessive trait are combined in a chromosome in a particular offspring.

Answer 9

When the recessive gene dominates.

Answer 10

When it dominates the controlling chromosome.