Question

In a test cross, an individual dominant for a certain trait ( whether homozygous or heterozygous is unknown) is crossed with a homozygous recessive individual. A plant with spherical seeds is crossed with another plant. If the genotypes and phenotypes of the offspring are 100% heterozygous and 100% dominant, what were the genotypes of the parents? (hint: try multiple crosses until you find what works) If the genotypes and phenotypes of the offspring are 50% heterozygous spherical seeds and 50% wrinkled seeds, what were the genotypes of the parents? A pea plant heterozygous for flower color and pod form is crossed with a heterozygous flower color and constricted pod. Predict the genotype and phenotype of the first generation (F1) using a Punnet square. In a monohybrid cross, a pea plant with purple flowers is crossed with a pea plant with white flowers. In the F1 generation, all the plants are purple. These F1 plants then self-pollinate. Predict the genotype of the F2 generation.

          In a test cross, an individual dominant for a certain
trait ( whether homozygous or heterozygous is
unknown) is crossed with a homozygous recessive individual. A plant
with spherical seeds is crossed with another plant.
If the genotypes and phenotypes of the offspring are
100% heterozygous and 100% dominant, what were the
genotypes of the parents? (hint: try multiple crosses until you
find what works)
If the genotypes and phenotypes of the offspring are
50% heterozygous spherical seeds and 50% wrinkled seeds, what were
the genotypes of the parents?
A pea plant heterozygous for flower color and pod form
is crossed with a heterozygous flower color and constricted pod.
Predict the genotype and phenotype of the first generation (F1)
using a Punnet square.
In a monohybrid cross, a pea plant
with purple flowers is crossed with a pea plant with white flowers.
In the F1 generation, all the plants are purple. These F1 plants
then self-pollinate. Predict the genotype of the F2
generation.

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Added by Kimberly M.

Biology for AP Courses

Julianne Zedalis, John Eggebrecht

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Solved by Expert Anand Jangid

07/11/2022

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In a test cross, an individual dominant for a certain trait ( whether homozygous or heterozygous is unknown) is crossed with a homozygous recessive individual. A plant with spherical seeds is crossed with another plant. If the genotypes and phenotypes of the offspring are 100% heterozygous and 100% dominant, what were the genotypes of the parents? (hint: try multiple crosses until you find what works) If the genotypes and phenotypes of the offspring are 50% heterozygous spherical seeds and 50% wrinkled seeds, what were the genotypes of the parents? A pea plant heterozygous for flower color and pod form is crossed with a heterozygous flower color and constricted pod. Predict the genotype and phenotype of the first generation (F1) using a Punnet square. In a monohybrid cross, a pea plant with purple flowers is crossed with a pea plant with white flowers. In the F1 generation, all the plants are purple. These F1 plants then self-pollinate. Predict the genotype of the F2 generation.

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Transcript

00:01 So here in first part of this question, we'll be talking about test cross.

00:08 Now in test cross, we perform a cross between a non -genotype and homocycus recessive genotype individual.

00:43 And then we observe the phenotype of the cross.

00:47 Now let's assume that allele capital a is the dominant allele and allele small a is the recessive allele.

01:00 We have an unknown genotype individual which has dominant phenotype.

01:07 Now there can be two situations.

01:10 One, when the unknown genotype is heterozygous and we cross it with homozycous or possessive individual for the press cross and there will be another situation when the dominant phenotype individual is homozygous dominant and to test that we cross it with homozygous recessive individual cross between them in the first situation.

01:40 Here we are taking chemids of homozygous recessive individual over the top and camits of hetrozygous individual across the side.

01:47 So the genotype of offspring will be getting are two hetrozygous individuals and two homozygous recessive individuals.

01:57 Now if the unknown genotype is hetrozygous, there would be two out of four or 50 percent are hetrozygous and dominant phenotype and two out of four or 50 percent are homozygous recessive and showing recessive phenotype.

02:47 Whereas if the unknown genome type is homozygous dominant cross between them let's draw upon its wire here again we are taking chemists of homozygous processive individuals over the top and homozygous dominant individuals across the side so the genotype of phosphings will be getting are all hetrozygous so if the unknown genotype is homozygous dominant four out of four or hundred percent are hetrozygous and will be showing dominant phenotype...

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