The most common form of hemophilia is a defect in blood clotting factor VIII, which is caused by a recessive form of a gene carried on the X chromosome. A girl is born with hemophilia. Both parents have normal phenotype

Which of the following might explain this girl's
hemophilia?
A. A nondisjunction event in sperm
production resulted in her receiving X and Y
chromosomes from her father, and an X from
her mother; she is XXY.
B. Nondisjunction during egg formation
resulted in her receiving no X chromosome
from her mother, but an X from her father;
she is XO.
C. Nondisjunction during sperm formation
resulted in her receiving no sex chromosome
from her father and an X chromosome from
her mother; she is XO.
D. Nondisjunction during egg formation
resulted in her receiving two X chromosomes
from her mother and an X chromosome from
her father; she is XXX.
E. She inherited an X chromosome from her
father and the X carrying the defective allele
from her mother.


C

Biology & Microbiology

You might also like to view...

_____________ is the primary force responsible for changes in allelic frequency of deleterious mutations. _______________ is the primary force responsible for changes in allelic frequency of neutral mutations

A. Genetic drift; Natural selection B. Natural selection; Genetic drift

Biology & Microbiology

Robertsonian translocations usually occur between what types of chromosomes?

A. Metacentric B. Acrocentric C. Telocentric D. Submetacentric

Biology & Microbiology

Ctenophores capture their food with feeding tentacles

a. True b. False

Biology & Microbiology

A gene locus is

a. a recessive gene. b. an unmatched allele. c. a sex chromosome. d. the location of an allele on a chromosome. e. a dominant gene.

Biology & Microbiology