1) At the beginning of metaphase 1, the two homologous chromosomes of a tetrad a

Question

1) At the beginning of metaphase 1, the two homologous chromosomes of a tetrad are held together by??

a. centromeres

b. terminal chiasma

c.synaptonemal complexes

d. kinetochores

2) The first evidence associating a specific gene/phenotype with a specific chromosome of the species under study was obtained by :

a. strurtevant

b. sutton and boveri

c. gregor mendel

d. thomas morgan

e. messelson and stahl

3) During mitosis the chromosomes are observed to be in two groups at the opposite poles of the cell. This cell is most likely more specifically in :

a. ProPHASE

b. anaphase

c. telophase

d. metaphase

e. cytokinesis

4) A human cell is observed to have 23 chromosomes, each with two chromatids. This cell is most likely :

a. in metaphase of mitosis

b.metaphase 1

c.metaphase II

d. in late prophase 1

e. late prophase of mitosis

5. Tetrads are most easily observed in mammalian cells during :

a. metaphase of mitosis

b. prophase of meiosis

c. metaphase of meiosis 1

d.prophase of meiosis I

e. metaphase of meiosis II

6) during meiosis synapsis occurs during:

a. anaphase I

b. metaphase I

c. metaphase II

d. prophase I

e. prophase I AND II

During which of the following phases of meiosis does the cell carry out the process referred to as homology search?

a.mitosis prophase

b. meiosis prophase I

c. meiosis prophase II

d. karyokinesis

e. Answers "a","b" and "c" are all correct.

7) The protein structures that are assembled in the regions between homologous during the early phases of meiosis I are called:

a. synaptonemal complexes.

b. centromeres.

c. nucleosomes.

d. kinetochores.

e. dyads.

Explanation / Answer

1.(b) At the beginning of metaphase 1, the two homologous chromosomes of a tetrad are held together by Terminal Chiasma

2.(d) The first evidence associating a specific gene/phenotype with a specific chromosome of the species under study was obtained by Thomas Morgan

3,(b),(c) During mitosis the chromosomes are observed to be in two groups at the opposite poles of the cell they move in Anaphase but are in Telophase

4.(c) A human cell is observed to have 23 chromosomes, each with two chromatids. This cell is most likely in Metaphase II

5. (c) Tetrads are most easily observed in mammalian cells during metaphase of meiosis 1

6. (d) during meiosis synapsis occurs during Prophase I

During which of the following phases of meiosis does the cell carry out the process referred to as homology search are mitosis prophase, meiosis prophase I and meiosis prophase II

7.(a) The protein structures that are assembled in the regions between homologous during the early phases of meiosis I are called Synaptonemal complexes

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