An allohexaploidy contains ______.

(a)

Six different genomes

(b)

Six copies of three different genomes

(c)

Two copies of three different genomes

(d)

Six copies of one genome

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?

(a)

25 AB, 25 ab, 25 Ab, 25 aB

(b)

10 AB, 10 ab

(c)

45 AB, 45 ab

(d)

45 AB, 45 ab, 5 Ab, 5aB

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. Crossing over is absent in complete linkage

(a)

1 and 2

(b)

2 and 3

(c)

3 and 4

(d)

1 and 4

Accurate mapping of genes can be done by three point test cross because increases _____.

(a)

Possibility of single cross over

(b)

Possibility of double cross over

(c)

Possibility of multiple cross over

(d)

Possibility of recombination frequency

Due to incomplete linkage in maize, the ratio of parental and recombinants are ______.

(a)

50:50

(b)

7:1:1:7

(c)

96.4: 3.6

(d)

1:7:7:1