How do you test for homozygous?
To identify whether an organism exhibiting a dominant trait is homozygous or heterozygous for a specific allele, a scientist can perform a test cross. The organism in question is crossed with an organism that is homozygous for the recessive trait, and the offspring of the test cross are examined.
How could the botanist best determine whether the genotype of the green pod plant is homozygous or heterozygous view available hint’s How could the botanist best determine whether the genotype of the green pod plant is homozygous or heterozygous cross the green pod plant with another green?
How could the botanist best determine whether the genotype of the green-pod plant is homozygous or heterozygous? Because the recessive homozygote will contribute an allele for the recessive characteristic to each offspring, the second allele (from the unknown genotype) will determine the offspring’s phenotype.
What is the genotype of a homozygous plant?
A homozygous plant contains either of the following alleles for seed shape: (RR) or (rr). The (RR) genotype is homozygous dominant and the (rr) genotype is homozygous recessive for seed shape. In the image above, a monohybrid cross is performed between plants that are heterozygous for round seed shape.
What is the genotype of a green seeded plant?
The dominant seed color is yellow; therefore, the parental genotypes were YY for the plants with yellow seeds and yy for the plants with green seeds.
What is the difference between heterozygous and homozygous?
Heterozygous refers to having inherited different forms of a particular gene from each parent. A heterozygous genotype stands in contrast to a homozygous genotype, where an individual inherits identical forms of a particular gene from each parent.
Is SS heterozygous or homozygous?
Specifically, heterozygous (Ss) individuals express both normal and sickle hemoglobin, so they have a mixture of normal and sickle red blood cells. In most situations, individuals who are heterozygous for sickle-cell anemia are phenotypically normal. Under these circumstances, sickle-cell disease is a recessive trait.
What is an example of homozygous?
Homozygous examples You can have brown eyes whether you’re homozygous (two alleles for brown eyes) or heterozygous (one for brown and one for blue). This is unlike the allele for blue eyes, which is recessive. You need two identical blue eye alleles in order to have blue eyes.
What are the chances of the offspring being homozygous for green seed color?
There are 3 genotypes produced. 25% of seeds are homozygous YELLOW, 50% are heterozygous, and 25% are homozygous green. This is a 1:2:1 genotypic ratio.
Which is the dominant allele in the heterozygous green pod plant?
In the case of the heterozygous green-pod plant (Gg), one gamete will receive the dominant allele (G), and the other gamete will receive the recessive allele (g). The law of segregation accounts for the prediction that 50% of the offspring of the test cross will have green pods and 50% will have yellow pods.]
What’s the probability that offspring will have green pods?
For example, the Punnett square on the right reveals that there is a 50% chance that each offspring will have green pods and a 50% chance that each offspring will have yellow pods. Suppose that the botanist carried out the test cross described in Parts A and B and determined that the original green-pod plant was heterozygous (Gg).
How did Mendel create the test cross plant?
The test cross itself occurs when the two plants are bred together, by taking pollen from the recessive plant, and carefully placing it on the flowers of the yellow pea plant. Mendel would then carefully rear all of the beans produced (which would be yellow) into plants of their own.
Can a heterozygous dominant plant produce yellow seeds?
However, in a dominant/recessive relationship, it is impossible to distinguish between a homozygous dominant plant (YY) and a hybrid, or heterozygous plant (Yy). Both would produce yellow seeds. However, if the Yy plant self-fertilizes, there is a chance of an offspring with the (yy) genotype, which would make green peas.