Q. 64.0( 6 Votes )
In human males all the chromosomes are paired perfectly except one. This/these unpaired chromosome is/are
I. large chromosome
II. small chromosome
A. (i) and (ii)
B. (iii) only
C. (iii) and (iv)
D. (ii) and (iv)
In human beings, there are 23 pair of chromosome, out of which one pair is sex chromosome. In males, there are two types of sex chromosomes-X and Y. In males, all chromosomes are paired except sex chromosomes. Hence, normal sized X chromosome and small sized Y chromosome are unpaired.
Rate this question :
Which statement is true for a dominant allele?All In One Science
A recessive homozygote is crossed with a heterozygote of the same gene. What will be the phenotype of the F 1 -generation?All In One Science
What determines the sex of a child?All In One Science
The genotype of the height of an organism is written as Tt. What conclusion may be drawn?All In One Science
Which statement about the genotypes of organisms is correct?All In One Science
In the second generation, the dwarf trait reappears during Mendel’s experiment in monohybrid cross. Why so?All In One Science
The genotype of green-stemmed tomato plants is denoted as GG and that of purple-stemmed tomato plants as gg. When these two are crossed,
i. What colour of stem would you expect in their F1 progeny?
ii. Give the percentage of purple-stemmed plants if F1 plants are self-pollinated.
iii. In what ratio would you find the genotypes GG and Gg in the F2 progeny?Xam idea - Science
How did Mendel explain that it is possible that a trait is inherited but not expressed in an organism?Xam idea - Science
In one of his experiments with pea plants, Mendel observed that when a pure tall pea plant is crossed with a pure dwarf pea plant, in the first generation, F1 only tall plants appear.
i. What happens to the traits of the dwarf plants in this case?
ii. When the F1 generation plants were self-fertilised, he observed that in the plants of the second generation, F2 both tall plants and dwarf plants were present. Why it happened? Explain briefly.Xam idea - Science