Two haploid yeast with the genotypes HIS4 LEU2 LYS2 and his4 leu2 lys2 were mated to produce diploid yeast. Next, the resulting diploid yeast went through meiosis and formed haploid spores. Read the 4 statements below. For each statement, either put “yes” if you agree with it or put “no” if you don’t. Explain your logic.     yes/no 1. Half of the spores will be His+ and half will be His-   2. Half of the spores will be Leu+ and half will be Leu-   3. Half of the spores will be Lys+ and half will be Lys-   4. Half of the spores will be His+ Leu+ Lys+ and half will be His- Leu- Lys-

The organism you are working with has the following chromosomes. Place the chromosomes of this organism onto the cell below such that the diagram accurately shows a primary meiocyte from this organism in metaphase I of meiosis. Note 1: Only place chromosomes you need. You don't need them all. Note 2: You can place the "Blank Box' image if you don't think you need a chromosome at a particular position. Dashed line - the metaphase plate 1.

6) The plant Haplepoppus gracilis is diploid (2n = 4). Inside each cell (represented here by the oval) there are four total chromosomes: one long pair (represented by "A" and "a") and one short pair (represented by "B" and “b"). The following diagrams represent possible anaphases of this cell during meiosis or mitosis. The lines represent chromosomes/chromatids being pulled to either the north or south pole of the cell, and the vertex of each "V" represent the centromere which would be attached to kinetochore microtubules. For representative cells 1– 12, say if the diagram represents a cell in anaphase I of meiosis I, anaphase II of meiosis II, anaphase of mitosis, or shows an impossible situation. If the situation is impossible, explain why. い。 VA Vb VA VB VV. V b Va VB VAVA Vo VB ^^ ^ が VaVA Vo VB くs

What will be the number of chromosomes in Turner’s syndrome and Klinefelter's syndrome of an organism whose haploid number is 20

Which of the following statements is true? Select one: a. Nondisjunction during anaphase I or anaphase II will have no effect on the gametes formed. b. More gametes will be affected if nondisjunction occurs during anaphase I than if nondisjunction occurs during anaphase II. c. More gametes will be affected if nondisjunction occurs during anaphase II than if nondisjunction occurs during anaphase I. d. Nondisjunction during anaphase I or anaphase II will have the same effect.

If an organism has a total diploid chromosome number of 18, how many chromosomes will be in a single gamete? 54 9. 18 36

Match each box to one of the descriptions

A diploid (2n) trihybrid individual with the genotype EeFfGg can make eight genetically different gametes.  Loci E/e and F/f are on chromosome 1 and locus G/g is on chromosome 2. Explain how a gamete containing the alleles e, f and g may be produced by meiosis. Refer specifically to meiotic events occurring during Prophase I, Metaphase I, Anaphase I and Anaphase II. (NB: remember to refer to the organism above).