Advertisements
Advertisements
प्रश्न
New species may be formed if
- DNA undergoes significant changes in germ cells
- chromosome number changes in the gamete
- there is no change in the genetic material
- mating does not take place
विकल्प
(i) and (ii)
(i) and (iii)
(ii), (iii) and (iv)
(i), (ii) and (iii)
उत्तर
(i) and (ii)
Explanation -
Gametes or sex cells are the cells involved in sexual reproduction. These gametes fuse to form a zygote which develops into a new organism. So, any change in the DNA or chromosome numbers of the gametes will be transmitted to the new organism. If this new organism with inherited changes in DNA or chromosome number may not reproduce with the existing members, this will be considered a new species.
APPEARS IN
संबंधित प्रश्न
Mendel published his work on inheritance of characters in 1865, but it remained unrecognised till 1900. Give three reasons for the delay in accepting his work.
The cross between two parents having one pair of contrasting characters
(a) State and explain the law of dominance as proposed by Mendel.
(b) How would phenotypes of monohybrid F1 and F2 progeny showing incomplete dominance in Snapdragon and co-dominance in human blood group be different from Mendelian monohybrid F1 and F2 progeny? Explain.
Define the following:
Allele
Mendel studied interitance of seven pairs of traits in pea which can have 21 possible combinations. If you are told that in one of these combinations, independent assortment is not observed in later studies, your reaction will be.
Hybridization between Tt × tt gives rise to the progeny of ratio ______.
A heterozygous violet-flowered pea plant is crossed to another homozygous violet- flowered pea plant. What percent of the progeny plants will have the recessive trait, i.e., white flowers?
Give the basic features of the mechanism of inheritance.
An organism with two identical alleles is
The maternal grandfather of a boy is colorblind, but his maternal grandmother is normal. The father of the boy is also normal. What is the probability of this boy being colorblind?
