The only possible way to inherit this disease, then, would be through the inheritance of the father's Y-chromosome. Since one parent has white eyes and the other has red eyes, we know the mother must have red eyes. Even in cases e.
Email address: Your name:. Without this gene, you get a female instead. The others encode proteins that appear to function only in the testes. The centromere is the site of attachment of two sister chromatids.
They produce both affected and unaffected children in the second generation, meaning that the disease cannot be recessive; if it were recessive, none of the second generation could be affected due to dominant alleles inherited from the mother.
The Living World. Telomerase is an enzyme that uses reverse transcription to extend telomeres after replication.
Furthermore, instead of females shutting down one X to balance the single X of the the two sex chromosomes are considered autosomes in Spokane — as we do — male flies double the output of their single X relative to that of females. In birds, moths, schistosomes, and some lizards, the male has two of the same chromosome designated ZZwhereas the female has "heterogametic" chromosomes designated Z and W.
Some characteristics are defined by a combination of several alleles with varying weight of expression. If an autosomal trait skips a generation, it must be recessive; however, if an autosomal trait does not skip a generation, it can be either recessive or dominant.
Each parent must have at least one recessive, white-eye allele. Without this gene, you get a female instead.
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