Advertisements
Advertisements
Question
Assertion: When the two genes in a dihybrid cross are situated on the same chromosome, the proportion of parental gene combinations is much higher than the nonparental type.
Reason: Higher parental gene combinations can be attributed to crossing over between two genes.
Options
Both A and R are true and R is the correct explanation of A.
Both A and R are true and R is not the correct explanation of A.
A is true but R is false.
A is false but R is true.
Advertisements
Solution
A is true but R is false.
Explanation:
Due to the decreased likelihood of crossing over, parental gene combinations occur more frequently than recombinant forms when two genes are on the same chromosome (linked genes). Higher parental gene combinations, however, result from linkage rather than crossing over. Instead of increasing parental kinds, crossing over increases recombinant types.
RELATED QUESTIONS
Complete the following sentence with appropriate word:
A character that is suppressed is _________.
Under which conditions does the law of independent assortment hold good and why?
In pea plants, yellow seeds are dominant to green. If a heterozygous yellow seed pant is crossed with a green seeded plant, what ratio of yellow and green seeded plants would you expect in the F1 generation?
Two linked genes a and b show 20% recombination. The individuals of a dihybrid cross between ++ /++ × ab/ab shall show gametes ______.
The process of mating between closely related individuals is ______.
In a dihybrid cross, F2 phenotypic ratio is 13 : 3. It is case of ______.
Which of the following statement is not correct for two genes that show 50% recombination frequency?
The Law of independent assortment is applicable for the traits which ______
