12th Bio Botany one marks - Lesson 3 - Online Test | Classical GeneticsChromosomal Basis of Inheritance

#1. An allohexaploidy contains ___________

Six different genomes

Six copies of three different genomes

Two copies of three different genomes

Six copies of one genome

#2. The A and B genes are 10 cM apart on a chromosome. If an AB/ab heterozygote is testcrossed to ab/ab, how many of each progeny class would you expect out of 100 total progeny?

25 AB, 25 ab, 25 Ab, 25 aB

10AB, 10ab

45 AB, 45 ab

45 AB, 45 ab, 5 Ab, 5aB

#3. Which of the following sentences are correct? 1. The offspring exhibit only parental combinations due to incomplete linkage 2. The linked genes exhibit some crossing over in complete linkage 3. The separation of two linked genes are possible in incomplete linkage 4. grossing over is absent in complete linkage

1 and 2

2 and 3

3 and 4

1 and 4

#4. Accurate mapping of genes can be done by three-point test cross because increases ___________

Possibility of single cross over

Possibility of double cross over

Possibility of multiple crosses over

Possibility of recombination frequency

#5. Due to incomplete linkage in maize, the ratio of parental and recombinants are ___________

50 : 50

7 : 1 : 1 : 7

96.4 : 3.6

1 : 7 : 7 : 1

#6. Genes G S L H are located on the same chromosome. The recombination percentage is between and G is 15%, S and L is 50% and H and S are 20%. The correct order of genes is ___________

GHSL

SHGL

SGHL

HSLG

#7. The point mutation sequence for transition, transition, transversion, and transversion in DNA are ________

A to T, T to A, C to G and G to C

A to G, C to T, C to G and T to A

C to G, A to G, T to A and G to A

G to C, A to T, T to A and C to G

#8. If the haploid number in a cell is 18. The double monosomic and trisomic number will be ___________

35 and 37

34 and 37

37 and 35

17 and 19

#9. Changing the codon AGC to AGA represents ___________

mis-sense mutation

non-sense mutation

rameshift mutation

deletion mutation

#10. How many map units separate two alleles A and B, if the recombination frequency is 0.09?

900 cM

90 cM

9 cM

0.9 cM

M	T	W	T	F	S	S
1	2	3	4	5	6	7
8	9	10	11	12	13	14
15	16	17	18	19	20	21
22	23	24	25	26	27	28
29	30	31

12th Bio Botany one marks – Lesson 3 – Online Test | Classical GeneticsChromosomal Basis of Inheritance