In humans, as well as in many other animals and some plants, the sex of the individual is determined by sex chromos
The sex chromosomes are one pair of non-homologous chromosomes. XX represents a female, while XY represents a male
When a gene for a specific trait is attached to the X or Y chromosome, we say it is sex-liriced, and when it is attached to the
chromosome, we say it is X-linked. Alleles for these linked traits, such as hemophilia or color blandness, crosses ray be
recessive or dominant.
This is one possible cross (above) for the X-linked condition known as hemophilia. Which pair of parents is most likely to have a
hemophiliac daughter?
-)
A)
carrier mother and unaffected father
B)
carrier mother and hemophiliac father
hemophiliac mother and a carrier father
D)
unaffected, non-carrier mother and hemophiliac father
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