3. Full pod shape (F) is dominant to constricted pod shape (f), yellow pod color (Y)...

3. Full pod shape (F) is dominant to constricted pod shape (f), yellow pod color (Y) is dominant to green pod color (y), and hairy stems (H) is dominant to hairless (h) in pea plants. The f, y & h genes are linked and reside upon the same chromosome. A pure-breeding green plant with full pods and hairy stems is crossed with a pure-breeding yellow plant with constricted pods and hairless stems. The genotypes of the parents are:

A. YYFFHH and yyffhh B. YYffHH and YYFFHH C. yyFFhh and YYffHH

D. yyFFHH and YYffhh E. YyFfHh and YyFfHh

4. Use the information from the previous question (number 5). What is the chromosomal arrangement of the f, y, & h genes, relative to each other, in the P1 generation?

A. y, f and h are all Trans B. y, f and h are all Cis C. y and f are Cis

D. y and h are Cis E. f and h are Cis

Expert Solution

Answer 3.

Parent 1 is green plants with full pods and hairy stems. Parent is pure breeding that means genotypes will be yy for green, FF for full length pod and HH for hairy stem. Means parent 1 genotype is yyFFHH.

Parent 2 is yellow plant with constricted pods and hairless stems. Genotype would be YY for yellow color, ff for constricted pod and hh for hairless stem. Thus, overall it becomes YYffhh.

Thus, option d is the answer.

Answer 4. Parents are yyFFHH and YYffhh.

Cis means arrangement of YFH on one homologue and YFH on another homologue. Means when dominant genes are present together on one homologue and recessive genes on the other.

Trans means YfH on one homologue and yFh on another. Or it could be yFH on one and Yfh on another. Means when dominant and recessive are mixed on a homologue chromosome.

Option e is the most promising. Because f and h are present together in the parents.

Gene sequence seems Y-F-H or y-f-h.

gladiator answered 2 years ago

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