In Sordaria, diploid cells heterogyzőus for the gene för spore color undergo meiosis and recombination occured between the nonsister chromatids. Explain why we should see an equal number of ascus with a 2:2:2:2 pattern and a 2:4:2 pattern ?

In a diploid organism that has a haploid complement of n=10, what is the formula and chromosome compliment of each individual? Chromosome complement Formula Total number of chromosomes 1. Trisomy      2. Monosomy     3. Tetraploid      4. Triploid

When the Ascomycetes fungus reproduces sexually, mating type A fungi cross fertilize mating type a fungi. The resulting zygotes undergo meiotic and then mitotic division to produce asci with eight ascospores. The ascospores in the asci are ordered and reflect the position of the parental nuclei in the zygote. Use the passage to answer the question. A fungus with white spores cross fertilizes a fungus with black spores. If 10% of the progeny bear white spores while 90% of the progeny bear black spores, what must be true? A. The trait for spore color is determined by exactly one gene. B. The trait for spore color is determined by more than one gene. C. The allele for black spores is dominant over that for white spores. D. The allele for white spores is dominant over that for black spores.

Which are the three tetrad types produced by meiosis of dihybrid yeast?

Why is meiosis necessary for sexual recombinations?

Draw a karyotype and label the homologous pairs and sister chromatids.

When is a tetrad specifically formed?  Would it be found in a haploid or diploid cell?  What event caused the mosaic (mixed) appearance of the 2 inside chromatids?