Study the following statements.

I. F₁ -progeny is the first hybrid generation and progeny resembles either of the two
parents.

II. F₂ progeny is a resultant hybrid generation of cross pollination among F₁ progeny and progeny shows retain as such both drawf and tall plants.

III. F₂ progeny is second hybrid generation, produced by selfing F₁ hybrids and progeny contained both drawf and tall plants.

IV. The proportion of probability of plants that were drawf were 1/4th of the F₂ plants while 3/4th of the F₂ plants were tall.

The correct statements are

• I, II, III, IV

• I, III, IV

• I, II, IV

• III, IV

222.

In sweet pea, C and P genes are essential for flower colour. In absence of either or both the genes, the flowers are white. What will be the percentage of coloured flowers in the offspring of cross Ccpp x ccPp?

• 75%

• 25%

• 80%

• 50%

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

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