Question

41. (6 pts) You are breeding two polyploid species of wheat. You cross the two different
species (parent 1 x parent 2) and obtain F1 hybrids. The following meiotic pairing was
observed in the F1 hybrid:
F1 hybrid = 12 bivalents + 12 univalents
(A) How many chromosomes are there in a non-dividing somatic cell of an F1 plant (i.e. what
is the organisms ploidy)?

(B) How many chromosomes are there in a non-dividing somatic cell of each parent (i.e. what
is the organisms ploidy)?

(C) For each parent, identify whether the plant is diploid, autopolyploid or allopolyploid.

In-Depth Questions - SHOW ALL OF YOUR WORK for the following questions. Write in complete and legible sentences. Answers that are unclear or illegible will not be graded. Note: You can receive partial credit for answers but cannot receive partial credit if you give no answer at all. 41. (6 pts) You are breeding two polyploid species of wheat. You cross the two different species (parent 1 x parent 2) and obtain F, hybrids. The following meiotic pairing was observed in the Fi hybrid: F, hybrid = 12 bivalents + 12 univalents (A) How many chromosomes are there in a non-dividing somatic cell of an F plant (.e. what is the organisms ploidy)? (B) How many chromosomes are there in a non-dividing somatic cell of each parent (i.e. what is the organisms ploidy)? (C) For each parent, identify whether the plant is diploid, autopolyploid or allopolyploid.

Answer 1

A)chromosome number in non dividing somatic cell of F1 plant is 12+(12+12)=36 triploid

12 bivalent means 24 chromosomes and 12 univalent means 12 chromosomes.

B)chromosome number in parent 1 is 24 and parent two is 48.parent 1 is diploid and parent two is tetraploid

C)parent 1 is diploid which has 24 number of chromosomes and parent 2 is allopolyploid which has 48 chromosome 24 from one species and other 24 from another species.

Wheat given in the question has the following character

haploid=12 chromosomes,diploid=24,triploid=36,tetraploid=48