Concept 13.2: Fertilization and meiosis alternate in sexual life cycles
Concept 13.2: Fertilization and meiosis alternate in sexual life cycles
Chromosomes
- karyotype
- homologous chromosomes (homologs)
- sex chromosomes vs. autosomes
- haploid vs. diploid
Life cycle (gametes/fertilization/zygote/adult)
- meiosis
Concept 13.3: Meiosis reduces the number of chromosome sets from diploid to haploid
Meiosis 1
- Prophase 1
synapsis/crossing over
Homework Answers
1. Karyotype = An image representing
the chromosomal composition of an organism
It is usually done on metaphase cells.
2. Homologous chromosomes = A pair of chromosomes similar in their size, structure, centromere location, and gene order
3. Sex chromosome = Allosome = A
chromosome involved in Sex determination
Ex: X and Y chromosomes in humans
4. Autosome = A chromosome that
carries information for vegetative characters
Ex: There are 22 autosomes in human genome
5. Haploid = n = The presence of a
single set of chromosomes
Diploid = 2n = The presence of two sets of chromosomes
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Concept 13.2: Fertilization and meiosis alternate in sexual life cycles
Which of these statements is false?
Which of these statements is false? In humans, each of the 22 maternal autosomes has a homologous paternal chromosome. Single, haploid (n) sets of chromosomes in ovum and sperm unite during fertilization, forming a diploid (2n), single-celled zygote. At sexual maturity, ovaries and testes produce diploid gametes by meiosis. In humans, the 23rd pair, the sex chromosomes, determines whether the person is female X) or male (XY). Sexual life cycles differ with respect to the relative timing of meiosis and fertilization. Answer:D
Match the following terms related to the human life cycle. Group of answer choices Haploid -...
Match the following terms related to the human life cycle. Group of answer choices Haploid - Diploid- Gamete- Mitosis- Meiosis- Fertilization- Zygote- Crossing over- Synapsis- Somatic cells- Gonad cell- Karyotype- Matching choices a. ordered display of an organisms chromosomes. b. cell with pairs of homologous chromosomes, 2n c. division of nuclei, ending with two 2n cells d. fusing of egg and sperm e. non-sex cells f.pairing of homologous chromosomes during prophase I g. cell with a single set...
Over Prophase 1 & Prophase 2 and independent Assortment in Prophase 1 only Sperm fertilizing erg...
Over Prophase 1 & Prophase 2 and independent Assortment in Prophase 1 only Sperm fertilizing erg in Telophase 2 and zygote formation after Cytokinesis 2 Question 3 1 pts Pg 99. Why is it essential that each gamete receive only one set of chromosomes, in other words. why must gametes be haploid? Because a haploid gamete can then fuse with a diploid egg or diploid sperm which promotes fertilization and development of a zygote. Because when gametes fuse in fertilization,...
Meiosis produces haploid gametes, how is the diploid number restored in diploid organisms? Sexual reproduction resulting...
Meiosis produces haploid gametes, how is the diploid number restored in diploid organisms? Sexual reproduction resulting in fertilization Reverse Meiosis O Production of sister chromatids during S phase Synapsis
please help! * Wmn one or ne Torrowing are TRUL regarding the process of meiosis I...
please help!
* Wmn one or ne Torrowing are TRUL regarding the process of meiosis I and NOT meiosis 11? A Chromosome number is reduced from diploid to haploid Sex Most homologue pairs have no crossovers during prophase C. Sister chromatids separate to opposite ends of the cell. D. Sister chromatids undergoing meiosis are always identical. 2. When does crossing over (synapsis) occur? A during prophase during fertilization. C. anaphase of mitosis. D. during prophase II. E. at the centromere
Review 8 Meiosis and Sexual Reproduction Use complete sentences.
Description Review 8 Meiosis and Sexual Reproduction Use complete sentences. 1. Summarize the role of meiosis in the human life cycle. 2. Compare sister chromatids to homologous chromosomes. 3. Identify two means by which meiosis results in genetically different gametes, and explain why this is important. 4. Compare the results/outcome of mitosis vs. meiosis. 5. How can a zygote can receive an abnormal chromosome number?
Name: Mitosis vs. Melosis Period Date: QUESTION 1 concept map comparing mitosis and meiosis. Use ...
Name: Mitosis vs. Melosis Period Date: QUESTION 1 concept map comparing mitosis and meiosis. Use the following te rms, each term can be diploid cell, one cell division, four haploid cells, parent ce cell divisions, body cell, same, chromosomes & cell, half, two diploid cells, forms haploid cell Use used one or more times: ll, two 2. Define homokgous chromosome 3. Define sister chromatids 4. Describe 2 parts of meiosis that are similar to mitosis. a. b. 5. Identify whether...
9. The fusion of a and a _produces a zygote with 46 (2n) chromosome number. 10....
9. The fusion of a and a _produces a zygote with 46 (2n) chromosome number. 10. During meiosis, the chromosome number: a) is doubled b) is reduced c) remains the same d) becomes diploid 11. Meiosis produces haploid (#) reproductive cells called _ 12. Name the 2 human gametes & tell their chromosome number. 13. Cells starting mitosis & meiosis begin with a (haploid or diploid) set of chromosomes. 14. How many times do cells divide during meiosis? 15. What...
Solve these 10 questions 11.Fill in the blanks. Suppose a cell at the end of S-phase...
Solve these 10 questions 11.Fill in the blanks. Suppose a cell at the end of S-phase has 48 chromatids. At the end of mitosis, each cell produced would have ______ chromosomes and ______ chromatids. 48, 96 24, 12 48, 48 24, 24 24, 48 12.Fill in the blanks. Suppose a cell at the beginning of meiosis has 36 chromosomes. This cell has ________ chromatids. At the end of meiosis, each of its "daughter cells" will have _________ chromosomes. 72, 18...
3. A diploid cell with eight chromosomes undergoes meiosis. (7 pt) a. How many chromosomes are...
3. A diploid cell with eight chromosomes undergoes meiosis. (7 pt) a. How many chromosomes are there in each cell after meiosis I? How many daughter cells are made after meiosis I? Are the daughter cells diploid or haploid? (1.5 pt) How many chromosomes are there in each cell after meiosis ll? How many daughter cells are made after meiosis II? Are the daughter cells diploid or haploid? (1.5 pt) What two mechanisms allow genetic variation among the gametes produced...
Over Prophase 1 & Prophase 2 and independent Assortment in Prophase 1 only Sperm fertilizing erg in Telophase 2 and zygote formation after Cytokinesis 2 Question 3 1 pts Pg 99. Why is it essential that each gamete receive only one set of chromosomes, in other words. why must gametes be haploid? Because a haploid gamete can then fuse with a diploid egg or diploid sperm which promotes fertilization and development of a zygote. Because when gametes fuse in fertilization,...
Meiosis produces haploid gametes, how is the diploid number restored in diploid organisms? Sexual reproduction resulting in fertilization Reverse Meiosis O Production of sister chromatids during S phase Synapsis
please help!
* Wmn one or ne Torrowing are TRUL regarding the process of meiosis I and NOT meiosis 11? A Chromosome number is reduced from diploid to haploid Sex Most homologue pairs have no crossovers during prophase C. Sister chromatids separate to opposite ends of the cell. D. Sister chromatids undergoing meiosis are always identical. 2. When does crossing over (synapsis) occur? A during prophase during fertilization. C. anaphase of mitosis. D. during prophase II. E. at the centromere
Name: Mitosis vs. Melosis Period Date: QUESTION 1 concept map comparing mitosis and meiosis. Use the following te rms, each term can be diploid cell, one cell division, four haploid cells, parent ce cell divisions, body cell, same, chromosomes & cell, half, two diploid cells, forms haploid cell Use used one or more times: ll, two 2. Define homokgous chromosome 3. Define sister chromatids 4. Describe 2 parts of meiosis that are similar to mitosis. a. b. 5. Identify whether...
9. The fusion of a and a _produces a zygote with 46 (2n) chromosome number. 10. During meiosis, the chromosome number: a) is doubled b) is reduced c) remains the same d) becomes diploid 11. Meiosis produces haploid (#) reproductive cells called _ 12. Name the 2 human gametes & tell their chromosome number. 13. Cells starting mitosis & meiosis begin with a (haploid or diploid) set of chromosomes. 14. How many times do cells divide during meiosis? 15. What...
3. A diploid cell with eight chromosomes undergoes meiosis. (7 pt) a. How many chromosomes are there in each cell after meiosis I? How many daughter cells are made after meiosis I? Are the daughter cells diploid or haploid? (1.5 pt) How many chromosomes are there in each cell after meiosis ll? How many daughter cells are made after meiosis II? Are the daughter cells diploid or haploid? (1.5 pt) What two mechanisms allow genetic variation among the gametes produced...
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