Within the sperm and egg cells of a frog, there are 13 chromosomes.  What would be the diploid #?

In a turtle species, a diploid cell in the G1 phase of the cell cycle contains 22 picograms of DNA (picogram is a measure of the total mass of the DNA present). How much DNA is present in a cell of the same species at prophase II of meiosis (prophase of the second meiotic division)?

Construct a table similar to that in Figure 2.12 for the different stages of meiosis, giving the number of chromosomes per cell and the number of DNA molecules per cell for a cell that begins with 4 chromosomes (two homologous pairs) in G1. Include the following stages in your table: G1, S, G2, prophase I, metaphase I, anaphase I, telophase I (after cytokinesis), prophase II, metaphase II, anaphase II, and telophase II (after cytokinesis).

A dog has78 chromosomes . How many chromosomes will a cell have after it goes through mitosis? And how many chromosomes will dog have after going through meiosis?

In a Drosophila where somatic cells have 8 chromosomes, and gametes have 4 chromosomes, what is the number of tetrads in a cell during metaphase II?

The mosquito, Aedes aegypti, has 3 bivalents (homologous pairs) formed at Meiosis I. How many chromosomes and chromatin strands are present in each of the following stages:

The Oregon creeping vole, Microtus oregoni, has a very unusual meiosis?. In this rodent, males are XY, while females are XØ (that is, females have only a single X chromosome). During female meiosis, eggs that receive no maternal X chromosome do not mature, so females only produce eggs with exactly one X chromosome. As chromosome content is unchanged from generation to generation, M. oregoni males (who are XY) must deliberately nondisjoin their sex chromosomes. 1a) What types of sperm would M. oregoni have to produce (considering only their sex chromosome content) so that progeny get the right chromosomes? Remember, no inviable combinations are normally produced. 1b) Draw a Punnett square for the sex chromosomes in a M. oregoni mating, with the gametes that are actually produced. Indicate the sex of each offspring. 1c) From which parent do M. oregoni get their X chromosomes? Circle one. Mom Only Random Mom or Dad Dad Only

If an non disjunction occurs in meiosis 2 in a male and the resulting sperm fertilizes a normal female egg, which of the following coujld result. Check ALL that apply a) YO b) XYY c) XXY d) XXX e) XO Polar bodies are formed during Male meiosis Female meiosis Both male and female meiosis Neither male nor female meiosis A brain cell in a normal human male would have a Y chromosome. a) True b) False