Advertisements
Advertisements
Question
A cross between two individuals results in a ratio of 9 : 3 : 3 : 1 for four possible phenotypes of progeny. This is an example of a ______.
Options
dihybrid cross
monohybrid cross
test cross
none of these
Advertisements
Solution
A cross between two individuals results in a ratio of 9 : 3 : 3 : 1 for four possible phenotypes of progeny. This is an example of a dihybrid cross.
Explanation:
A 9 : 3 : 3 : 1 phenotypic ratio is the characteristic F2 generation ratio of a dihybrid cross, where two pairs of contrasting traits are inherited independently according to Mendel’s Law of Independent Assortment.
APPEARS IN
RELATED QUESTIONS
How did Mendel interpret his results to show that traits may be dominant or recessive? Describe briefly.
Name the information source for making proteins in the cells.
List any two contrasting characters other than height that Mendel used in his experiments in pea plants.
Mendel in one of his experiments with pea plants crossed a variety having round seed with one having wrinkled seeds. Write his observations, giving reasons, of F1 and F2 progeny
A man with blood group A marries a woman with blood group O and their daughter has blood group O. Is this information enough to tell you which of the traits – blood group A or O – is dominant? Why or why not?
Name the first scientist who studied the inheritance of traits from one generation to the next.
Fill in the following blank with suitable word .
In pea plants, the gene for dwarfness is ..............whereas that for tallness is ............ .
Name the scientist who gave the laws of inheritance.
Gregor Mendel's first law of genetics states "Of a pair of contrasted characters, only one can be represented in a gamete by its internal 'factor' State where these factors are found in gametes.
Give the contrasting traits of the following characters in pea plant and mention which is dominant and which is recessive :
Round seed
The following results were obtained by a scientist who crossed the F1 generation of pure-breeding parents for round and wrinkled seeds.
| Dominant trait | Recessive trait | No. of F2 offspring |
| Round seeds | Wrinkled seeds | 7524 |
From these results, it can be concluded that the actual number of round seeds he obtained was ______
The term 'father of genetics' is used for the scientist :
(a) Morgan
(b) Mendel
(c) Darwin
(d) Marie Curie
One of the following traits of the parents cannot be passed on to their future generations. This trait is:
Explain Mendel’s law of independent inheritance. Give one example.
Explain the mechanism of hereditary changes.
Hereditary characters are transferred from parents to offspring by ______ hence they are said to be structural and functional units of heredity.
What is genetics?
If a round, green seeded pea plant (RR yy) is crossed with wrinkled, yellow seeded pea plant, (rr YY) the seeds produced in F1 generation are
If a tall pea plant is crossed with a pure dwarf pea plant then, what percentage of F1 and F2 generation respectively will be tall?
