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 ............. .

(c) Most people have ....... earlobes but some have ....... earlobes.

(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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Solution

(a) Pairs
(b)Recessive ,Dominant
(c)Free,Attatched
(d)23,46
(e)Four
(f)Sex Female, Male

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Similar questions

Q. 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 ............ .
(c) Most people have ............earlobes but some have ............earlobes.
(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.

Fill in the blanks
(a) Mitosis occurs in our ..... cells.
(b) Mitosis produces two daughter cells whereas meiosis produces ...... daughter cells.
(c) Meiosis occurs only in ..... cells.
(d) Modern humans have 46 chromosomes. Their sperms and eggs will have......chromosomes each.
(e) During the pairing of chromosomes in meiosis, the ...... chromosomes come to lie side by side.
(f) The.......(s) are surrounded by radiating rays and termed as aster.

(a) If a normal human cell has 46 chromosomes , how many chromosomes will be there in a human

(i) sperm cell,

(ii) zygote ?

(b) What sizes of plants are produced if both parents have genes Tt?

Q. Statement I: Traits in humans such as hair color, eye color, shape of earlobes etc. are controlled by chromosomes.
Statement II: Genes are sections of DNA found on the chromosomes.

Q. 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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(a) Pairs (b)Recessive ,Dominant (c)Free,Attatched (d)23,46 (e)Four (f)Sex Female, Male

(a) Pairs
(b)Recessive ,Dominant
(c)Free,Attatched
(d)23,46
(e)Four
(f)Sex Female, Male