INHERITANCE AND VARIATION biology MCQ’s questions answers

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INHERITANCE AND VARIATION

Question 141 [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Validity of Mendel's law of segregation is established when ..... [MPPMT 2004]
A
Two hybrids are crossed
B
A parent is crossed with F1 hybrid
C
Two pure breeding contrasting traits are crossed
D
None of the above
Question 142 [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
ABO blood grouping in humans is an example of .....[HPPMT 2011]
A
polygenic inheritance
B
Multiple alleles
C
Incomplete dominance
D
Epistasis
Question 143 [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Number of genotypes produced when individuals of genotype 'YyRrTt; are crossed with each other ..... [Wardha 2000]
A
4
B
45
C
28
D
27

it's a formula just get it.....genotype=3n; phenotypes=2n for YyRrTt.....so just count n=3
thus 33 = 27 gnotypes and 23 = 8 phenotypes
.....now if it is YYRrTt then n=2

Question 144 [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
A test cross is performed to know ..... [CBSE 2012]
A
Genotype of F2 dominants
B
Linkage between two traits
C
Number of alleles of a gene
D
Success of intervarietal and interspecific cross
Question 145 [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
the offspring of AA bb $\times$ aa BB is crossed with, aabb. the genotypic ratio of progeny will be ..... [CPMT 2007]
A
9:3:3:1
B
1:2:1
C
1:1:1:1
D
4:1
There are 145 questions to complete.