When is the sex of an offspring decided
At ovulation
During meiosis
During cleavage
At fertilization
- The science dealing with study of inheritance and variation is
- A pure tall pea plant was reared in a soil poor in nutrition and reached the size of a pure dwarf pea…
- Transfer of a gene or genes through a virus is called
- How many meiosis will be required to produce 102 pollen-grains ?
- Chromosomes exhibit minimum coiling during
- A person meets with an accident and great loss of blood has occurred. There is no time to analyse…
- An offspring of two homozygous parents different from one another by alleles at only one gene locus…
- Dyad is
- Down's syndrome is an example of
- A giant chromosome having many chromo-nemata lying side by side all along their length is called
- The term 'meiosis' was coined bv
- Lethal genes are those which
- The segment of DNA which participates in crossing over is known as
- The possibilities of hereditary and evolutionary changes are greatest in species that reproduce by
- In a monohybrid cross the Fi ratio of a backcross is
- A child is bom with an extra chromosome in each of its cells. This is usually the result of
- Crossing over in meiosis occurs in
- When two genes are situated very close to each other in a chromosome
- Linkage is
- A codon is a sequence of 3 nucleolides on
- Colour blindness is caused due to
- If an individual does not breed true for its characters, it is called
- Which disease results from the genetic inability to synthesize a single enzyme ?
- The first person to induce mutations was
- In the Operon concept, the regulator gene regulates chemical reactions in the cell by
- Among the following which is a test cross?
- The crossing of a homozygous tall plant with a dwarf would yield plants in the ratio of
- Mutations which are not dominant are not lost by a gene pooL This is known as
- Base substitutions from base analogues I are called
- When is the sex of an offspring decided