Biology, 14.06.2021 21:10, shartiarahoward

Red rose color is produced by either of two genes, R/r and I/i. The dominant alleles of both these genes produce red pigment, and one of these genes is enough to produce a red flower. The recessive alleles are nonfunctional and produce no pigment (remember that no pigment = white. Required:
What is the overall phenotypic ratio from the cross above?

Answers: 2

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Answers

answered: dugochukwu12

3:1

Explanation:

To find out the phenotypic ratio, we need to do a Punnet Square.

We know that R and I are the dominant alleles that produce red flowers, and r and i are the recessive traits.

║R ║ r

I ║RI║Ir

i ║Ri║ir

The genotype ratio would be 3 because the dominant traits are present three times (RI, Ir, and Ri) and 1 for the recessive trait since it only appears once in the Punnet Square (ir). In conclusion, the phenotypic ratio form the roses are 3:1

answered: BluSeaa

Complete question:

Red rose color is produced by either of two genes, R/r and I/i. The dominant alleles of both these genes produce red pigment, and one of these genes is enough to produce a red flower. The recessive alleles are nonfunctional and produce no pigment (remember that no pigment = white.

a. Given the allele combinations below, state the phenotype and expected ratio (as a fraction that would result from a cross of two dibybrid roses. (Ex: A B : Green 9/16)

R-I-

rrI-

R-ii

rrii

b. What is the overall phenotypic ratio from the cross above? (Ex black: 3 yellow : 1 green)

c. What type of epistasis is this? (Note there is a word bank below) Dominant epistasis, Dominant suppression, Duplicate gene action, Recessive epistasis, Complementary gene action No Epistasis

9/16 R-I-, 3/16 R-ii, 3/16 rrI-, 1/16 rrii15:1Duplicate gene action

Explanation:

Available data:

Red rose color produced by two diallelic genesGene 1: Dominant allele R

Recessive allele r

Gene2: Dominant allele I

Recessive allele i

The dominant alleles of both these genes produce the red pigmentOne of these genes is enough to produce a red flowerThe recessive alleles produce no pigment

a. Given the allele combinations below, state the phenotype and expected ratio (as a fraction) that would result from a cross of two dibybrid roses.

R-I-

rrI-

R-ii

rrii

Cross: Two dihybrids

Parentals) Rr Ii x Rr Ii

Gametes) RI, Ri, rI, ri

RI, Ri, rI, ri

Punnett square) RI Ri rI ri

RI RRII RRIi RrII RrIi

Ri RRIi RRii RrIi Rrii

rI RrII RrIi rrII rrIi

ri RrIi Rrii rrIi rrii

F1) 9/16 individuals are expected to be red R-I-

3/16 individuals are expected to be red R-ii

3/16 individuals are expected to be red rrI-

1/16 individual is expected to be white rrii

b. What is the overall phenotypic ratio from the cross above? (Ex black: 3 yellow : 1 green)

Red individuals 15/16

White individual 1/16

Phenotypic ratio → 15:1

c. What type of epistasis is this? Dominant epistasis, Dominant suppression, Duplicate gene action, Recessive epistasis, Complementary gene action No Epistasis

Duplicate gene action. There are two genes involved in the expression of a phenotype, and the presence of at least one dominant allele is enough to produce the dominant phenotype (in this case, red color). The phenotypic ratio of this interaction is always 15:1. This is an example of dominant duplicate genes.

answered: Guest

kelp are large brown algae that live in cool, relatively shallow waters close to the shore. they grow in dense groupings much like a forest on land. these underwater towers of kelp provide food and shelter for thousands of fish, invertebrates, and marine mammal species.

e) all of the above

answered: Guest

C. gemstones they are the only non metallic mineral from the list.

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Red rose color is produced by either of two genes, R/r and I/i. The dominant alleles of both these g...