Linkage maps:

1.	always have a total of 100 map units.
2.	can be used to pinpoint the precise physical position of a gene on a chromosome.
3.	are a genetic map based on recombination frequencies.
4.	reflect the frequency of crossing over between X and Y chromosomes.

A true breeding red striped tree frog is crossed with a true breeding plain green frog. All progeny have red stripes. This is because:

A plant breeder is raising many varieties of plants. As a part of the breeding program, he raises pure line varieties by continuous inbreeding over several generations – one with red flowers and another with white flowers. How can Mendel's laws be demonstrated by hybridization between these varieties?

All the following are mechanisms of sex determination in living organisms except:
1. The Z-W system
2. The X-O system
3. The haplo-diploid system
4. The parthenogenetic system

Pedigree analysis rather than conventional methods are used to study genetic traits because:

Match the disorder in Column I with the location of the gene causing it in Column II and select the correct option from the codes given:

Codes:

The pedigree shown below cannot be:

The recombination frequencies for four different linked genes of Drosophila are shown in the figure:

The order of the four genes will be:

Given below are different levels of organization of genetic material. Arrange them in the correct descending order of their size:

The inheritance of the trait shown in the given pedigree is best explained as a/an:

1. Autosomal dominant disorder
2. Autosomal recessive disorder
3. Sex-linked dominant disorder
4. Sex-linked recessive disorder