Hemophilia is an X-linked recessive disorder (Xh) that is passed through generations and can be traced by using a pedigree. Based on the pedigree that is shown, which describes John? A)carrier for hemophilia B)expresses hemophilia C)does not have hemophilia D)expresses hemophilia and died of complications

C) Does not have hemophilia

Explanation:

When a pedigree is half shaded, the person is a carrier.

When a pedigree is not shaded, the person doesn't express the gene.

When a pedigree is completely shaded, the person is affected.

Square usually is male and circles are usually female.

Since John is the non-shaded square and parent of 4 offspring, he does not have hemophilia. However, his wife is a carrier, and that's how their offspring have hemophilia.

interphase

the period of cell growth when the cell synthesizes new molecules and organelles. the cell is not dividing and it constitutes the majority of the time spent in the cell cycle

prophase

changes occur in the nucleus and cytoplasm. the chromatin condenses to form structures (sister chromatids) visible with a light microscope and the mitotic spindle begins to form, but the nucleus is still in tact

prometaphase

the nuclear envelope fragments and the spindle microtubules attach to the kinetochores of the sister chromatids

metaphase

all the cell's duplicated chromosomes are lined up at an imaginary plane equidistant between the poles of the mitotic spindle

anaphase

begins when sister chromatids separate from each other and ending when a complete set of daughter chromosomes arrives at each of the two poles of the cell

telophase

the daughter nuclei form at the two poles of a cell

cytokinesis

the division of a cytoplasm to form two separate daughter cells. usually occurs during telophase during mitosis. this and mitosis make up to mitotic (m) phase of the cell cycle