Is it true or false that the number of phenotypes produced for a given trait depends on how many genes control the trait?

Answer 1

The formula that predicts the number of genotypes from the number of genes is 3 to the power n. (n is the number of genes.) The following is the number of genotypes for a selected number (n) of genes which control an arbitrary trait.

#genes------------- # genotipes

1---------------- --------3

2 ------------------------9

5 ------------------------243

10 ----------------------59,049

ergo the number of phenotypes is proportionally related to the number of genes for that sequence.

Answer 2

For sex-linked isomorphic phenotypes:

Individual genes are characterized as dominant or recessive, where X is a dominant and x is a recessive. XX and Xx exhibit the dominant phenotype, where as only xx exhibited the recessive phenotype. So say two people mated who both had Xx genes. Possible offspring include:

---X--x

X XX Xx

x Xx xx

So there is a 3:1 chance the offspring is phenotypically dominant, a 1:1 chance that they are a carrier of the recessive gene, and a 1:3 chance they exhibit the recessive phenotype.

In some instance heterogeneous genotypes (Xx) are phenotypically distinct from the homogeneous phenotypes. In these instances, there is a 1:3 chance the offspring exhibits either the dominant or recessive phenotype, and a 1:1 chance they exhibit the distinct Xx phenotype.

However, this is just scratching the surface, since there are polymorphic phenotypes, and individual genes with more than 2 isoforms.

Answer 3

umm true.. unless you need an answer im assuming its a true/false question

or

The number of genes that control the trait