A women with albinic father marries an albinic man. The proportion of her progeny is

• 2 normal : 1 albinic

• All normal

• All albinic

• 1 normal : 1 albinic

362.

Who formulated the chromosomal theory of linkage

• T H Morgan and W Castle

• Stern and Hotta

• Pontecarvo

• Bridges and Burns

A pea with white flower was crossed with another pea with white flower. When they selfed, the F₂ generation produced purple and white in the ratio of 9:7. The reason for the result is that

• it is typical monohybrid Mendelian ratio

• purple flower colour is dominant over white

• it is a complementary factor

• None of the above

The gene controlling seven traits in pea studied by Mendel were later found to be located on the following number of chromosomes

• seven

• four

• five

• six

The crossing of a homozygous tall pea plant and homozygous dwarf pea plant would yield plants in the ratio of

• 2 tall : 2 dwarf

• all heterozygous tall

• all homozygous dwarf

• one homozygous tall; one homozygous dwarf; two heterozygous tall

The offsprings obtained by mating two pure strains having constrasting characters are called as

• mutants

• hybrids

• F₂ - generation

• P - generation

What is not true about alleles?

• Round and wrinkled form of genes are alleles of each other

• Only recessive alleles expreses in hybrid

• Alleles occupy same loci on homologous chromosomes

• Two or more alternative forms of gene are called alleles are allelomorphs

In Mendelian monohybrid cross, phenotypic ratio in F₂ is 3 :1. How many types of gametes are formed in F₁ -generation?

• Two types

• Four types

• Eight types

• Only one types

Mendel enunciated

• two principles of inheritance

• four principles of inheritance

• five principles of inheritance

• three principles of inheritance

Rarely observed phenotype in population is called

• wild type

• mutant type

• variant type

• All of these