A new variety of fast plant was identified that expressed purple leaves and red

Question

A new variety of fast plant was identified that expressed purple leaves and red hairs. A true-breeding strain of this plant was crossed with a true-breeding green leaf and hairless strain and all of the progeny were green-leafed and hairless. One of these F1 strains was back-crossed with the hairy purple parental (you might need to make a punnet square to figure out your expected ratio) and the following progeny of the cross were observed: 402 green/hairless, 396 purple/hairy, 116 green/hairy, and 125 purple/hairless.

a. How many genes are involved in these two characters?

b. State the nature of the alleles (dominant/recessive) and if they assort independently or not (using the chi-square statistic to support your answer- show your work!) Hint: you'll probably need to set up a punnet square at some poin

Explanation / Answer

Answer:

a). two genes with four allele (each gene consists of two alleles) are involved

b).

Green= G; purple=g

Hariless= H; Hairy= h

(purple leaves and red hairs) gghh X GGHH (green leaf and hairless )---Parents

GgHh (green leaf and hairless )---F1

Test cross--GgHh X gghh

Accoring to independent assortment, all test cross progeny would be in eqaul proportion, but it is not the case. So the gene are not assorted independently, instead they are linked.

Chi-Square value= 298.83

So the genes are not assorted independently.

gh GH GgHh (green leaf and hairless) Gh Gghh (green leaf and hairy) gH ggHh (purple leaf and hairless ) gh gghh (purple leaf and hairy)

Related Questions

Navigate

• Browse (All)
• Browse A
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.