What would be the phenotypic ratio of YyRr X YyRr?
What would the phenotypic ratios of the offspring resulting from YYRr x YyRr be? All Y (yellow), 3:1 (round:wrinkled).
What is the phenotype of YyRr?
YY is the homozygous dominant genotype (2 Y alleles). The phenotype of this genotype is yellow seed color. Yy is the heterozygous genotype (one dominant allele, one recessive allele). The phenotype of this genotype is yellow seed color….Mendelian genetics review.
| female\male | yr |
|---|---|
| YR | YyRr |
What is YyRr?
When a true-breeding plant (organism with identical alleles) that is yellow and round (YYRR) is cross-pollinated with a true-breeding plant with green and wrinkled seeds (yyrr), as in the example above, the resulting F1 generation will all be heterozygous for yellow seed color and round seed shape (YyRr).
What do the grind boxes in a Punnett square represent?
What do grid boxes represent in a Punnet square? All the possible allele combinations in the offspring.
What is the F2 phenotypic and genotypic ratio?
The normal phenotypic ratio in F2 generation is 3:1 and the genotypic ratio is 1:2:1.
What type of cross is shown in the Punnett square?
In this cross, known as a dihybrid cross, both parents are heterozygous for pod color (Gg) and pod form (Ff). Punnett Square for Two Characteristics. This Punnett square represents a cross between two pea plants that are heterozygous for two characteristics.
What do each of the 4 squares of a Punnett square represent?
Types of Punnett Squares For a monohybrid cross, these are 2X2 squares with four boxes, each representing one fertilization event between the parent gametes. The 4X4 square is necessary since each of the parents can produce four types of gametes, based on the distribution of the alleles of the two genes.
How to make a Punnett square from a cross?
Punnett square: lists all possible gamete combinations from a cross and figures out all possible genotypes from a cross. In this case, the YY genotype can only produce gametes with a Y genotype, and the yy genotype can only produce gametes with a y genotype. Construct the square by filling in the blanks down from the top and across from the left.
How are gametes represented in a Punnett square?
An easy, organized way of illustrating the offspring that can result from two specific parents is to use a Punnett square. The gametes that can be generated by each parent are represented above the rows and next to the columns of the square. Each gamete is haploid for the “A gene”, meaning it only contains one copy of that gene.
Where are the haploid eggs in a Punnett square?
In the Punnett square seen in Figure 5, haploid eggs are above each column and haploid sperm are next to each row. When a haploid sperm and a haploid egg (each with 1 copy of the “A gene”) combine during the process of fertilization, a diploid offspring (with 2 copies of the A gene) is the result.
How are Y and R related to peas?
As previously shown, Y dominates y to determine seed color, and R factor for “round” dominates the r factor for “wrinkled” to determine seed shape. He then proceeded to test his hypothesis experimentally. The P (Parental) cross is between true-breeding lines of wrinkled yellow peas (rrYY) and round green peas (RRyy).