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Meiosis and Genetics: Chromosome Number, Gametes, and Gene Mapping, Study notes of Cell Biology
A review of key concepts related to meiosis and genetics, including the number of chromosomes in gametes, the process of gamete formation, and the use of gene mapping to understand inheritance patterns. Quiz questions cover topics such as chromosome number during meiosis, the formation of gametes, the occurrence of crossing over, and the creation of a gene map.
What you will learn
- When does crossing over occur?
- What happens to the chromosome number during meiosis?
- Which process forms gametes?
- What is a pedigree chart?
- What is used to construct a gene map?
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Ch 11.4, 11.5, and 14.
Review
Game
What happens to the chromosome
number during meiosis?
- A It doubles
- B It stays the same
- C It halves
- D It becomes diploid
- Ans: C
- A Prophase I of Mitosis
- B Prophase I of meiosis
- C Telophase II of Meiosis
- D Prophase II of Mitosis
- Ans: B
When does crossing over
occur?
Which of the following is used to
construct a gene map?
- A Chromosome number
- B Litter count
- C Rate of meiosis
- D Recombination rate
- Ans: D
- A prophase I of meiosis
- B metaphase I of meiosis
- C interphase
- D anaphase II of meiosis
- Ans: A
Chromosomes form tetrads
during
A common genetic disorder
characterized by bent and twisted
red blood cells is
- A Cystic fibrosis
- B Hemophilia
- C Sickle cell disease
- D Muscular dystrophy
- Ans: C
- A diploid cells
- B haploid cells
- C 2N daughter cells
- D body cells
- Ans: B
Meiosis results in the formation
of
If two genes are on the same
chromosome and rarely assort
independently,
- A Crossing-over never occurs between the genes
- B Crossing-over always occurs between the genes.
- C The genes are probably located far apart from each other
- D The genes are probably located close each other.
- Ans: D
Which of the following can be
observed in a karyotype? Write
all letters that apply
- A a change in a dna base
- B autosomes
- C sex chromosomes
- D Genes
- E Alleles
- F an extra chromosome
- G homologous chromosomes
- Ans: B, C, F, G
A human female inherits
- A All of the same genes that a human male inherits
- B Twice as many sex chromosomes as a human male inherits
- C One copy of every gene located on the Y chromosome
- D Two copies of every gene located on the X chromosome
- Ans: D
Compared with normal
hemoglobin, the hemoglobin of
a person with sickle cell disease
- A is longer
- B is shorter
- C has a different sequence of amino acids
- D is wider
- Ans: C
#7 p. 283- the illustration
represents what stage of
meiosis?
- A Prophase I
- B Anaphase II
- C Telophase I
- D Metaphase I
- Ans: D
To maintain the chromosome
number of an organism, the
gametes must
- A Become diploid
- B Become recessive
- C Be produced by mitosis
- D Be produced by meiosis
- Ans: D
A gene map shows
- A The number of possible alleles for a gene
- B The relative locations of genes on a chromosome
- C Where chromosomes are in a cell
- D How crossing-over occurs
- Ans: B