Question

Problem VI In plants of the genu s Primula, the K locus controls synthesis of a compound called malvidin rozygous at the K locus were crossed, producing the following distribution of progeny 1010 Make malvidin 345 Do not make malvidirn You wish to determine if the D locus (located on a different c production of malvidin as well. True-breeding plants that make malvidin (KK dd) were to true-breeding plant malvidin. synthesis, yielded the following distribution: hromosome from K), affects s that do not m ake malvidin (kk DD). All Fi plants failed to produce Fi heterozygotes were self-fertilized, and the F2 progeny, assayed for malvidin 522 Make malvidin 2270 Do not make malvidin a. Write the genotypes and the corresponding phenotypes of all the F2 progeny obtained. b. Does the D locus affect malvidin synthesis? What is the basis of your conclusion?

Answer 1

Answer:

a). not make make malvidin = KKDD, KKDd, KdDD, KdDd, kkDD, kkDd * kkdd

Malvidin = KKdd & Kkdd

b).

Yes, D locus affect malvidin synthesis.

The ratio is similar to 13:3 ratio. This ratio is resulted in dominant and recessive interaction mechanism.

Sometimes the dominant alleles of one gene locus (D) in homozygous and heterogygous (DD, Dd) condition and homozygous recessive alleles kk of another gene locus (K) produce the same phenotype. The F₂ ratio will become 13: 3.

not make make malvidin = KKDD, KKDd, KdDD, KdDd, kkDD, kkDd * kkdd

Malvidin = KKdd & Kkdd

The genotype AABB, AaBB, AAbb, Aabb and aabb produce one type of phenotype and genotype aaBb, aaBB will produce another type of phenotype.

KKdd (malvidin) x kkDD (do not make malvidin)—Parents

KkDd (malvidi) --------------------------------------------F1

KkDd x KkDd ---------------------------------------------F1 self-fertilization

	KD	Kd	kD	Kd
KD	KKDD ( not make malvidin)	KKDd (not make malvidin)	KkDD (not make make malvidin)	KkDd (not make make malvidin)
Kd	KKDd (not make malvidin)	KKdd (malvidin)	KkDd (not make make malvidin)	Kkdd (malvidin)
kD	KkDD (not make malvidin)	KkDd (not make make malvidin)	kkDD (not make make malvidin)	kkDd (not make make malvidin)
Kd	KkDd (not make malvidin)	Kkdd (malvidin)	kkDd (not make make malvidin)	kkdd (not make malvidin)