Fill in the blanks with a suitable word.
(i) A character that is masked is considered ............... while that which is expressed is known as ..........
(ii) .......... are male and female sex cells.
(iii) Mendel's second law of inheritance is called ............
(iv) Humans have ......... chromosomes.
(v) Genes that exist in more than two forms are called ........... alleles.

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Solution

(i) A character that is masked is considered recessive while that which is expressed is known as dominant.
(ii) Gametes are male and female sex cells.
(iii) Mendel's second law of inheritance is called law of segregation.
(iv) Humans have 46 chromosomes.
(v) Genes that exist in more than two forms are called multiple alleles.

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Similar questions

Column I	Column II
(a) Genetics	(i) Chromosomes similar in size and shape.
(b) Autosomes	(ii) The alternative forms of a gene.
(c) Recessive	(iii) Study of laws of inheritance of characters.
(d) Allele	(iv) A gene that can express only when in a similar pair.
(e) Homologous chromosomes	(v) Chromosomes other than the pair of sex chromosomes.

\begin{matrix} Column I & Column II i. Behaviour of chromosomes & p. Occur in pairs ii. Laws of inheritance & q. Parallel to genes iii. Chromosomes and genes & r. Occur on same loci iv. Alleles & s. Mendel \end{matrix}

Fill in the following blanks with suitable words :

(a) Genes always work in ............ .

(b) In pea plants , the gene for dwarfness is ........... whereas that for tallness is ............. .

(d) A human gamete contains ........ chromosomes whereas a normal body cell has ....... chromosomes in it.

(e) All races of man have ...... blood groups.

(f) The ....... chromosomes for a ........ are XX whereas that for a .......... are XY.

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