Crossing Over

Q.

What are 3 things that a substitution mutation causes?

Q.

In what ways does meiosis generate genetic variation?

Q. Crossing over is a source of variation because:

1. Chromosomes are swapped during crossing over
2. Part of DNA is exchanged during crossing over
3. Due to exchange, genes are redistributed
4. Redistributed genes give new combinations

Q. Crossing over is a source of variation because:

1. Redistributed genes give new combinations
2. Chromosomes are swapped during crossing over
3. Due to exchange, genes are redistributed
4. Part of DNA is exchanged during crossing over

Q. Why variations occur in DNA.?

Q.

Crossing over in diploid organism is responsible for

1. Linkage between genes
2. Segregation of alleles (genes)
3. Recombination of linked allele (genes)
4. Dominance of genes

Q.

define F1 F2 generations.

Q.

Crossing over results in recombinant traits.

1. True

2. False

Q.

what are the factors affecting linkage?

Q. The difference in characters between the organisms of same species is called .

1. variation
2. evolution
3. speciation

Q. If 3 genes are involved in multiple alleles, how many genotypes are expected? (1)27, (2)9, (3)6, (4)4

Q. Genetic variations can lead to creation of new species.

1. True
2. False

Q. Variations that affect germ cells are called somatic variations.

1. False
2. True

Q. Crossing over of chromosomes during meiosis leads to variation.

1. True
2. False

Q. Crossing over results in recombinant traits.

1. False
2. True

Q. The location at which crossing over occurs is known as

1. Centromere
2. Chiasmata
3. Kinetochore
4. Centriole

Q. A cell having 46 chromosomes will form daughter cells having chromosomes after meiosis.

1. 92
2. 23
3. 46
4. 13