In guinea pigs, the allele for black fur (B) is dominant over the allele for brown (b) fur. A black guinea pig is crossed with a brown guinea pig, producing five F1 black guinea pigs and six F1 brown guinea pigs. a. How many copies of the black allele (B) will be present in each cell of an F1 black guinea pig at the following stages: G1, G2, metaphase of mitosis, metaphase I of meiosis, metaphase II of meiosis, and after the second cytokinesis following meiosis? Assume that no crossing over takes place. b. How many copies of the brown allele (b) will be present in each cell of an F1 brown guinea pig at the same stages as those listed in part a? Assume that no crossing over takes place.
Oogenesis
The formation of the ovum (mature female gamete) from undifferentiated germ cells is called oogenesis. This process takes place in the ovaries (female gonads). Oogenesis consists of three stages known as the multiplication phase, growth phase, and maturation phase.
Cell Division
Cell division involves the formation of new daughter cells from the parent cells. It is a part of the cell cycle that takes place in both prokaryotic and eukaryotic organisms. Cell division is required for three main reasons:
In guinea pigs, the allele for black fur (B) is dominant over the allele for
brown (b) fur. A black guinea pig is crossed with a brown guinea pig,
producing five F1 black guinea pigs and six F1 brown guinea pigs.
a. How many copies of the black allele (B) will be present in each cell of
an F1 black guinea pig at the following stages: G1, G2, metaphase of
mitosis, metaphase I of meiosis, metaphase II of meiosis, and after the
second cytokinesis following meiosis? Assume that no crossing over takes
place.
b. How many copies of the brown allele (b) will be present in each cell of
an F1 brown guinea pig at the same stages as those listed in part a?
Assume that no crossing over takes place.
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