Question

A crossover in meiosis is an exchange of genetic material between

A) sister chromatids of the same chromosome.
B) sister chromatids of homologous chromosomes.
C) sister chromatids of non-homologous chromosomes.
D) non-sister chromatids of homologous chromosomes.
E) non-sister chromatids of non-homologous chromosomes.

2.

A tetrad is made up of

A) four non-homologous chromosomes.
B) four non-homologous chromatids.
C) four homologous pairs of chromosomes.
D) two homologous pairs of chromosomes.
E) two homologous chromosomes, each consisting of two chromatids.

3.

Which of the following statements about crossing over is TRUE?

A) It occurs only in males.
B) It occurs only in some chromosomes.
C) It occurs only between genes that are heterozygous.
D) It results in reduced genetic variation among gametes.
E) None of the above

4.

Crossing-over occurs during prophase I of meiosis.

A) True
B) False

5.

Crossing-over allows the reassortment of linked genes.

A) True
B) False

Answer 1

A crossover in meiosis is an exchange of genetic material between

A) sister chromatids of the same chromosome.

B) sister chromatids of homologous chromosomes.

C) sister chromatids of non-homologous chromosomes.

D) non-sister chromatids of homologous chromosomes.

E) non-sister chromatids of non-homologous chromosomes. ✓

• During meiosis, the two chromosomes in each parent,swipe their place resulting in a hybrid new genetic material

2.A tetrad is made up of

A) four non-homologous chromosomes.

B) four non-homologous chromatids.

C) four homologous pairs of chromosomes.

D) two homologous pairs of chromosomes.

E) two homologous chromosomes, each consisting of two chromatids. ✓

• Tetrad is a group of four chromatids formed in pachytene stage of meiosis

3. Which of the following statements about crossing over is TRUE?

A) It occurs only in males.

B) It occurs only in some chromosomes.

C) It occurs only between genes that are heterozygous.

D) It results in reduced genetic variation among gametes.

E) None of the above ✓

• The process of crossing over takes place between homologous chromosomes to increase genetic diversity

4.Crossing-over occurs during prophase I of meiosis.

A) True ✓

B) False

• crossing over helps in genetic variation and occurrs between prophase 1 & metaphase 1

5. Crossing-over allows the reassortment of linked genes.

A) True ✓

B) False

• Crossing over helps in the reassortment of non-sister chromatids of non-homologous chromosomes

Answer 2

The first person is right