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) Genes always work in pairs.
(b) In pea plants, the gene for dwarfness is recessive, whereas that for tallness is dominant.
(c) Most people have free earlobes but some have attached earlobes.
(d) A human gamete contains 23 chromosomes, whereas a normal body cell has 46 chromosomes in it.
(e) All races of man have different blood groups.
(f) The sex chromosomes for a female are XX, whereas that for a male are XY.

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Similar questions

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.

(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?

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.

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.

Q. Haemophilia and colourblindness are the disorders caused by X chromosome linked recessive gene. A woman has one X chromosome having gene for haemophilia and colourblindness. The other X chromosome has wild allele for both the characters. She marries a man having phenotype normal for both the traits. Which of the following statement is most likely for the progeny?

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