Name: Worksheet for Mitosis and Meiosis Lab: Part B Answer the following questio

Question

Name: Worksheet for Mitosis and Meiosis Lab: Part B Answer the following questions: 1. During meiosis, which division is reductional? a. meiosis I b. meiosisII c. both meiotic divisions 2. Which meiotic division is similar to mitosis? b. meiosis I a. meiosis I c. both meiotic divisions 3. Mendel's law of independent segregation depends on the random positioning of centromeres at which meiotic division a. meiosis I b. meiosis c, both meiotic divisions 4. Humans have 46 chromosomes in their kidney cells. How many are found in sperm cellis? c. 48 e, none of these 4.- -- b. 46 5. How many are found in an egg? a. 23 b. 46 d. 92 e. none of these 5. 6. Mice have 20 bivalents visible in Meiosis I. Fill in the table below indicating how many chromosomes and how many chromatid Cell t Metaphase of meiosis I Prophase of meiosis Il G1 mitosis G2 mitosis s per chromosome are p t in each of the cell types chromosomes # chromatids/ chromosome cell 7. What stage of meiosis is characterized by complete pairing of chromosomes and crossingover? b. pachynema c. leptonema d. diplonema a. zygonema 8. In some grasshopper species there is no Y chromosome. Males of one of these species have only one X chromosome and 5 pairs of autosomes. Females have 2 X chromosomes and 5 pairs of autosomes. Males therefore have 11 chromosomes and females have 12. Meiosis in females produces eggs with: b. 6 chromosomes e. both a and b a. 5 chromosomes 9. Meiosis in males produces sperm with: a. 5 chromosomes d. 12 chromosomes b. 6 chromosomes e. both a and b c. 11 chromosomes 10. During meiosis in males of this grasshopper species, how many bivalents and how many unpaired chromosomes are present at metaphase I? a. 5 bivalents, 1 univalent b. 6 bivalentsC11 bivalents, 1 univalent d. 12 bivalents e. both a and b 34

Explanation / Answer

1. Meiosis I is reductional division because is chromosome number is reduced to half.

2. Meiosis II is same as mitosis

3. As chromosomes get separated into different gametes at the time of meiosis, particular gene too segregated on order to have one of the two alleles.

4. Since in germ cells, no. of chromosome is half it will be 23

5. In egg, there will be 46 chromosome at it is the fertilized product.

6. Bivalent is formed during prophase of meiosis I , it have 2 chromosome and 4 chromatid. Since in the question, 20 bivalent are present so,

i. Metaphase of meiosis I --- 80 chromatid and 40 chromosome

ii. prophase of meiosis ii—40 chromatid and 20 chromosome

iii. G1 mitosis- 40 chromatid and 20 chromosome

iv. G2 mitosis- 80 chromatid and 40 chromosome

v. Egg--80 chromatid and 40 chromosome

7. Crossing over between homologous chromosome take place at pachytene stage.

8. Female grasshopper will have one 6 chromosome . 1 X and other 5 autosomes.

9. Male grasshopper will have 5 autosomes chromosome

10. Male gamete have 5 bivalent and 1 univalent

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