Which one of the following cannot be explained on the basis of Mendel's Law of Dominance?
(1) The discrete unit controlling a particular character is called a factor
(2) Out of one pair of factors one is dominant, and the other is recessive
(3) Alleles do not show any blendings and both the characters recover as such in F2 generation.
(4) Factors occur in pairs
What is the means of segregation in Law of segregation?
(1) Allelic separation
(2) Chromosomal separation
(3) Crossing over
(4) Linkage
Which of the following about the law of segregation is true?
(1) It states that each of two alleles for a given trait segregate into same gametes.
(2) It can be explained by the segregation of heterologous chromosomes during meiosis.
(3) It can account for the 3:1 ratio seen in the F2 generation of Mendelʹs crosses.
(4) It is a method that can be used to determine the number of chromosomes in a plant.
In guinea pigs, black coat color is a dominant trait and white is a recessive trait. When heterozygous black pigs are intercrossed the chance of the first two offspring being black is:
(1) 75 %
(2) 56 %
(3) 44 %
(4) 6 %
The law of Segregation is based on the fact that
1. The alleles do not show any blending
2. There is random fertilization
3. Gametes are pure for the trait
4. The zygotes are diploid
A graphical representation to calculate the probability of all possible genotypes of offspring in a genetic cross is called as:
1. Forked line diagram
2. Punnett square
3. Pedigree chart
4. Idiogram
1. Law of dominance
2. Law of segregation
3. Law of independent assortment
4. Law of linkage
| I. | the fact that the alleles do not show any blending and that both the characters are recovered as such in the F2 generation though one of these is not seen at the F1 stage. |
| II. | the fact that though the parents contain two alleles during gamete formation, the factors or alleles of a pair segregate from each other such that a gamete receives only one of the two factors. |
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| Assertion (A): | A recessive character that is not expressed in heterozygous condition can express when it becomes homozygous. |
| Reason (R): | Characters segregate during the formation of gametes. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | Both (A) and (R) are false. |
| I: | In Incomplete Dominance F1 has a phenotype that does not resemble either of the two parents and is in between the two. |
| II: | In Co-Dominance F1 has a phenotype that resembles both the parents. |
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
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