Question

In a certain plant species, the height of plant and the colour of the flower are controlled by two different genes. Tallness and blue flowers are dominant phenotypes whereas dwarfness and orange flowers are recessive. A pure breeding dwarf plant with orange flowers was crossed with a pure breeding tall plant with blue flowers to produce F1 plants. (a) Using "T" and "t" to represent the alleles controlling the height; and "B" and "b" to represent the alleles controlling the colours, state the genotype of the following parents. (2) • Pure-bred dwarf plant with orange flowers _ • Pure-bred tall plant with blue flowers _ (b) Using Punnett square, work out the genotype and phenotype of F1 plants. (4) Then, the F1 plants produced were allowed to pollinate with pure-bred dwarf plant with orange flowers. (c) Using Punnett square, work out the genotype, phenotype and phenotypic ratio in F2 plants. (8) ( ) ( ) ( ) ( ) Phenotypic ratio

          In a certain plant species, the height of plant and the colour of the flower are controlled by two different genes. Tallness and blue flowers are dominant phenotypes whereas dwarfness and orange flowers are recessive. A pure breeding dwarf plant with orange flowers was crossed with a pure breeding tall plant with blue flowers to produce F1 plants. (a) Using "T" and "t" to represent the alleles controlling the height; and "B" and "b" to represent the alleles controlling the colours, state the genotype of the following parents. (2) • Pure-bred dwarf plant with orange flowers ___________ • Pure-bred tall plant with blue flowers ___________ (b) Using Punnett square, work out the genotype and phenotype of F1 plants. (4) Then, the F1 plants produced were allowed to pollinate with pure-bred dwarf plant with orange flowers. (c) Using Punnett square, work out the genotype, phenotype and phenotypic ratio in F2 plants. (8) ( ) ( ) ( ) ( ) Phenotypic ratio

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In a certain plant species, the height of plant and the colour of the flower are controlled by two different genes. Tallness and blue flowers are dominant phenotypes whereas dwarfness and orange flowers are recessive. A pure breeding dwarf plant with orange flowers was crossed with a pure breeding tall plant with blue flowers to produce F1 plants. (a) Using "T" and "t" to represent the alleles controlling the height; and "B" and "b" to represent the alleles controlling the colours, state the genotype of the following parents. (2) • Pure-bred dwarf plant with orange flowers • Pure-bred tall plant with blue flowers (b) Using Punnett square, work out the genotype and phenotype of F1 plants. (4) Then, the F1 plants produced were allowed to pollinate with pure-bred dwarf plant with orange flowers. (c) Using Punnett square, work out the genotype, phenotype and phenotypic ratio in F2 plants. (8) ( ) ( ) ( ) ( ) Phenotypic ratio

Added by Larry L.

Biology for AP Courses

Julianne Zedalis, John Eggebrecht

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Solved by Expert Marlyn Joyce

06/02/2022

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Step 1: The genotype of the purebred dwarf plant with orange flowers is ttbb. Show more…

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In a certain plant species, the height of plant and the colour of the flower are controlled by two different genes. Tallness and blue flowers are dominant phenotypes whereas dwarfness and orange flowers are recessive. A pure breeding dwarf plant with orange flowers was crossed with a pure breeding tall plant with blue flowers to produce F1 plants. Using "T" and "t" to represent the alleles controlling the height; and "B" and "b" to represent the alleles controlling the colours, state the genotype of the following parents. (2) Pure-bred dwarf plant with orange flowers. Pure-bred tall plant with blue flowers. Using Punnett square, work out the genotype and phenotype of F1 plants. (4) Then, the F1 plants produced were allowed to pollinate with pure-bred dwarf plant with orange flowers. Using Punnett square, work out the genotype, phenotype and phenotypic ratio in F2 plants. (8) Phenotypic ratio.

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Transcript

00:01 Hello, so let's answer now the question.

00:03 So we have here two genes.

00:05 We have the gene for height and the gene for the flower color.

00:09 So for height, we have here the allele for tall, which is tea or big tea.

00:19 And we have here for dwarf or short, we have here small letter t.

00:31 And for the flower color, the blue one is dominant.

00:36 So we have here capital b and the orange is recessive color.

00:43 We have here small letter b.

00:46 So take note that tall is dominant over dwarf and blue is dominant over orange.

00:52 So we are asked what is the genotype of pure breed dwarf plant with orange flower.

01:02 So for option or for part a, okay.

01:08 Our answer here for pure breed dwarf plant.

01:12 So that would be t, t, homozygous recessive t.

01:17 And then with orange flowers, that would be homozygous recessive b.

01:24 And for the second part of part a, we are asked what is the genotype of the pure breed tall plant with blue flowers.

01:33 So the genotype for pure breed tall is homozygouser.

01:38 Dominant t and then we have homozygous dominant blue okay so this is the genotype let's proceed to the part b of the question we are asked if we cross the pure breed tall plant with blue flower with pure breed dwarf plant with orange flower what would be the f1 generation offspring so let's show to them let's show to this pundit square the result of the f1 generation.

02:17 So we have here a cross of the purebred tall blue flower and purebred dwarf orange flower...

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