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प्रश्न
Select the statements that describe characteristics of genes
- genes are specific sequence of bases in a DNA molecule
- a gene does not code for proteins
- in individuals of a given species, a specific gene is located on a particular chromosome
- each chromosome has only one gene
पर्याय
(i) and (ii)
(i) and (iii)
(i) and (iv)
(ii) and (iv)
उत्तर
(i) and (iii)
Explanation -
A gene is a segment of DNA that codes for a protein. An organism has a number of genes present on the different chromosomes and each occupies a specific location of a particular chromosome. So, out of given four statements, statements (i) and (iii) are the characteristics of genes.
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संबंधित प्रश्न
Write the types of sex-determination mechanisms the following crosses show. Give an example of each type.
(i) Female XX with Male XO
(ii) Female ZW with Male ZZ
In a human, how many chromosmes are present in a brain cell?
In human males all the chromosomes are paired perfectly except one. This/these unpaired chromosomes is/are :
(i) large chromosome
(ii) small chromosome
(iii) Y chromosome
(iv) X chromosome
The sex of a child is determined by which of the following?
(a) the length of the mother's pregnancy
(b) the length of time between ovulation and copulation
(c) the presence of and X chromosome in an ovum
(d) the presence of a Y chromosome in a sperm
The person A has only B chromosomes in all its gametes. On the other hand, another person C has chromosome D in half of gametes and chromosome E in the other half of gametes. When chromosomes B and D combine during fertilisation, a female zygote results. On the other hand, combination of B and E chromosomes produces a male zygote.
(a) What are chromosomes (i) B (ii) D, and (iii) E?
(b) Out of B, D and E, which two chromosomes are of the same type?
(c) Which chromosome is smaller in size?
(d) What is the general name of chromosomes such as B and E?
(e) Out of the two persons A and C, which one is (i) male, and (ii) female?
Name any two genetic in humans.
In which livings, female decides the sex? Give two examples.
Explain the mode of sex determination in honeybees.
Human offspring’s sex is determined ______
