In Drosophila, the situation is very different.

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

‘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.

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.

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.

It is the loss of one chromosome from a set.

It is the state of having abnormal number of chromosomes.

A gene would be called sex controlled if it is inherited by both males and females, but expressed differently in the phenotype of a boy and a girl.

In human beings, the presence of a Y-chromosome is required for the development of a male sex phenotype. In human beings, the presence of a Y-chromosome is required for the development of a male sex phenotype.

In Klinefelter’s syndrome, the chromosomal constitution of man is 22AA + XXY.Few men have XX karyotype and yet are males. This is a rare phenomenon due to translocation of a small segment of Y chromosome attached to an X chromosome and is inherited in concert with X. In Klinefelter’s syndrome, the chromosomal constitution of man is 22AA + XXY.Few men have XX karyotype and yet are males. This is a rare phenomenon due to translocation of a small segment of Y chromosome attached to an X chromosome and is inherited in concert with X.

This is the correct option.