There is a teacher from Texas that loves hairless guinea pigs. In guinea pigs, the dominant allele H codes for the trait of having hair and the allele h codes for the trait of being hairless. (Assume Mendelian inheritance). Let’s say that this teacher receives her wish of finding a hairless guinea pig at a pet store and names her Genevieve. She finds another guinea pig at a store with hair that she names Fred. While she can be certain of Genevieve’s genotype, how could she determine what genotype Fred is? She can do a test cross! A test cross involves breeding an organism with a dominant trait (like Fred) with an organism that exhibits a recessive trait (like Genevieve).

9. Genevieve has the genotype .

10. Fred’s genotype could be or .

11. If Fred was genotype and bred with Genevieve…

13. If Fred was genotype and bred with Genevieve…

See the answer below

Explanation:

9. The genotype of Genevieve would be hh since hairlessness (h) is a recessive trait.

10. Fred's genotype could be HH or Hh since hairiness (H) is dominant over hairlessness (h)

11. If Fred's genotype is HH and it breeds with Genevieve:

        HH    x    hh

     Hh   Hh   Hh   Hh

All the resulting offspring would be hairy with the genotype Hh.

12. If Fred has the genotype Hh and is bred with Genevieve:

          Hh    x    hh

       Hh   Hh   hh   hh

50% of the resulting offspring would be hairy with the genotype Hh and the remaining 50% would be hairless.

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