In Drosophila, the situation is very different.

In this condition the progenies obtained will be fifty percent homozygous recessive and fifty percent heterozygous.

Monosomy means 2n - 1, i.e. (2 X 10) - 1 = 20 - 1 = 19. 

GUU,GUC,GUA,GUG represents valine.

‘Gametes are never hybrid’. It is a statement of law of segregation. 

A normal female with XX chromosomes has one Barr body. A normal male (XY) has none. Abnormal males with three XXY (Klinefelters' syndrome) have one Barr body.

YyRr X yyrr produces yellow round, yellow wrinkled, green round and green wrinkled progeny.

DNA generally acts as a template for the synthesis of DNA during replication and RNA during transcription. DNA does not act as a template for the synthesis of protein.

Sex-influenced traits are autosomal traits that are influenced by sex.

Phenylketonuria (PKU) is a caused due to mutation in gene on chromosome 12.Gene codes for phenylalanine hydroxylase that breaks phenylalanine into other products.

  Limulus is a living fossil.A living fossil is a living species (or clade) of organism that appears to be similar to a species otherwise known only from fossils. Normally the similarity is only a superficial physical resemblance between two different species, one extinct, the other extant.

 Reverse transcription is the formation of DNA from RNA by enzyme reverse transcriptase. This phenomenon was discovered by ‘Tamin and Baltimone’ and thus, known as ‘Teminism’.

 Xenia is the effect of pollen on endosperm. It is the effect such as increase in size on the embryo or endosperm of a plant  resulting from fertilisation with the pollen of a genetically distinct variety.

When chromosome sets are present in multiples of ‘n’, the condition is called euploidy.

This indicates that there is an extra chromosome in the diploid.

In DNA, two nucleotides are linked by phosphate diester bonds.

It is the loss of one chromosome from a set.

It is the state of having abnormal number of chromosomes.

 ‘Homo erectus’ is the zoological name of Peking man.

 Theory of spontaneous generation was supported by Van Helmont. He insisted that knowledge of the natural world could be obtained only by experimentation.