Table of Contents
- 1 What is the ratio of genotypes when you cross 2 heterozygous individuals?
- 2 What is the probability of two heterozygous purple flowers making offspring that have white flowers?
- 3 What are the genotypic and phenotypic of 2 purple flowers?
- 4 What is the ratio of purple offspring to white offspring?
- 5 What is the genotypic ratio of a pea plant?
What is the ratio of genotypes when you cross 2 heterozygous individuals?
The expected genotype ratio when two heterozygotes are crossed is 1 (homozygous dominant) : 2 (heterozygous) : 1 (homozygous recessive). When a phenotypic ratio of 2 : 1 is observed, there is probably a lethal allele.
What is the phenotypic ratio when you cross 2 heterozygous parents?
What is the probability of two heterozygous purple flowers making offspring that have white flowers?
The probability that one of their offspring will have white flowers is 1/4 .
What is the phenotypic ratio of a heterozygous cross?
A testcross to a heterozygous individual should always yield about a 1:1 ratio of the dominant to recessive phenotype. So, both the genotypic and phenotypic ratios here are 50:50.
What are the genotypic and phenotypic of 2 purple flowers?
A pair of alleles—one from each parent—makes up the genotype for a trait. In pea plants, purebred purple flowers have a genotype with two purple alleles, which produces a phenotype of purple petals. Purebred white flowers have a genotype of two white alleles, which displays the white phenotype.
What would the ratio of purple flowers to white flowers be if PP and PP were crossed?
Only offspring with the pp genotype will have the white-flower phenotype. Therefore, in this cross, you would expect three out of four (75 percent) of the offspring to have purple flowers and one out of four (25 percent) to have white flowers.
What is the ratio of purple offspring to white offspring?
If a purple flower with the genotype P p (P = purple ; p = white) self-pollinates, what is the ratio of purple offspring to white offspring? The flower is purple which means P is dominant (every time is in the flower will be purple). There are four possibilities: PP pP Pp pp, in the first 3 it will be purple and in the last it will be white.
What is the genotypic ratio for a cross?
The genotypic ratio for this cross is written 1:2:1. In animals and plants, each gene has 2 alleles or variations, one from each parent.
What is the genotypic ratio of a pea plant?
Figure 1: The image above shows a Punnett square monohybrid cross of male and female pea plants that are both heterozygous dominant for purple. The genotypic ratio for this cross is written 1:2:1. In animals and plants, each gene has 2 alleles or variations, one from each parent.
What is the genotypic ratio of a Punnett square cross?
This more easily understood by using the Punnett square method and a basic monohybrid cross as shown in Figure 1. Figure 1: The image above shows a Punnett square monohybrid cross of male and female pea plants that are both heterozygous dominant for purple. The genotypic ratio for this cross is written 1:2:1.