What sons and daughters are expected from a marriage with a man having membranous toes?

Date: 2015-10-07; view: 518.

From marriage of a man with color-blindness to healthy woman normal daughters and sons were born. What offspring can be expected from their marriage with healthy persons and persons with color-blindness?

Thus, the features associated with the X chromosome, the male can get only from the mother. Sex-linked inheritance is known in various animal species. In humans, for this type of inheritance certain diseases exist: hemophilia (bleeding associated with reduced blood clotting), blindness (inability to distinguish difference between red and green), optic atrophy – recessive features. In all these cases, female offspring is usually good, but the transmitter is a hereditary defect - a conductor.

Females always get one of the X-chromosome from the father, the other - from the mother. Males obtained his only X chromosome from the mother and Y chromosome from the father. X chromosome contains many genes, and Y-chromosome is much poorer than the X chromosome on the content of genes.

Sex-linked heredity

Tasks

1. What offspring can be expected from the marriage of a hemophilic man with a healthy woman, which is not a "conductor", taking proper account that the normal blood clotting - the dominant feature?

2. What offspring is expected from the marriage of a hemophilic man and a woman - "conductor"?

Deviations in sex ratio in some species of animals