Changes will take effect once you reload the page. However, the Y chromosome doesn't contain most of the genes of the X chromosome. All of the female offspring are heterozygous receiving an X-chromosome with a red allele from their mother and an X-chromosome with the white allele from their father. Autosomes come in pairs of homologous chromosomes. Female mammals make eggs, which always have an X chromosome.
How do autosomal traits differ from sex-linked traits?
Sex chromosomes and sex-linked inheritance - An Introduction to Genetic Analysis - NCBI Bookshelf
In Drosophila and many other experimental systems, a superscript plus sign is used to designate the normal, or wild-type allele. An abnormal gene on the X chromosome from each parent would be required, since a female has two X chromosomes. Males have only one X chromosome. And there you have it. Hence the female is said to be the homogametic sex.
Genes in the homologous region show what might be called X-and-Y linkage. Philadelphia, PA: Elsevier; chap 5. Mothers can pass X-linked dominant conditions to both their sons and daughters. Dominant inheritance occurs when an abnormal gene from one parent can cause a disease, even though a matching gene from the other parent is normal.
Easy-to-Read Materials Read more. See all questions in Linked Genes. Dominant inheritance occurs when an abnormal gene from one parent causes disease, even though the matching gene from the other parent is normal. Click on the different category headings to find out more.