A cross between two heterozygous parents is called a dihybrid cross, monohybrid cross..?

Answer 1

A dihybrid cross means there are two traits being measured and the "hybrid" part means that the parents are both heterozygous. A monohybrid cross is two heterozygous parents crossed where only one trait is measured.

Answer 2

well it depends on how many traits you are crossing.. a cross between two heterozygous parents can be either.. if you are crossing one trait for example just "eye color." the cross is a monohybrid cross.

when you cross two traits for example "ear lobe" and "eye color" the cross is called a dihybrid cross..

Answer 3

a million. 2. Dominant characteristics in straightforward terms take a million allele to alter into obvious. Recessive characteristics take 2. 3. Genotype is the define of the alleles. ex: Gg, GG, gg. Phenotype is the define of the actual visual allure. ex: enormous, tall, short, fat, around, wrinkly, etc. 4. Homozygous is whilst the alleles are the comparable. ex: GG, gg. Heterozygous is whilst they're distinctive. ex: Gg. 5. Monohybrid crosses in straightforward terms coach the achievable effects for a million gene. Dihybrid crosses coach the achievable effects for 2. 6. Crossing over enables the genes on one chromosome to change with extremely some the genes of yet another chromosome, for that reason segregating the genes on the two chromosomes. 7. :) %. mine because of fact the terrific answer please!

Answer 4

A dihybrid cross is a cross in which two hybrids are mated to test for dominant genes and recessive genes in two separate characteristics, and such a cross has a variety of uses in Mendelian genetics and genetic linkage experiments. The dihybrid genotype is usually created when two different parental individuals that are true breeding (homozygous) for different alleles of two genes are sexually crossed or mated together. Their resulting progeny possesses the "dihybrid" genotype and is heterozygous for alleles of two genes. The dihybrid is also often referred to as the double heterozygote. When two dihybrids with the same genotype are mated together, the mating is referred to as a dihybrid cross.

Alleles in genetic crosses are usually indicated by capital and lower case letters with dominant alleles designated by capitals and recessive alleles designated by lower case letters. Thus, a dihybrid cross is usually shown as following the form Aa Bb X Aa Bb. Here one parent (usually female by convention) precedes the X and another parent (usually male) follows the X.

Meiosis is the cellular process of gamete creation, it is quite literally where sperm and eggs get the unique set of genetic information that will be used in the development and growth of the offspring of the mating. The rules of meiosis as they apply to the dihybrid are codified in Mendel's First Law and Mendel's Second Law also called the Law of Segregation and the Law of Independent Assortment.

For genes on separate chromosomes each allele pair shows independent segregation. If the first filial generation (F1 generation) produces four offspring, the second filial generation, which occurs by crossing the members of the first filial generation, shows a phenotypic (appearance) ratio of 9:3:3:1.


[edit] Punnett square for a Dihybrid Cross
In the pea plant, two characteristics for the peas, shape and color, will be used to demonstrate an example of a dihybrid cross in a punnett square. R is the dominant gene for roundness for shape, with lower-case r to stand for the recessive wrinkled shape. Y stands for the dominant yellow pea, and lower-case y stands for the recessive green color. By using a punnett square (the gametes are RY, Ry, rY, and ry):


RY Ry rY ry
RY RRYY RRYy RrYY RrYy
Ry RRYy RRyy RrYy Rryy
rY RrYY RrYy rrYY rrYy
ry RrYy Rryy rrYy rryy


The result is a 9:3:3:1 phenotypic ratio, as shown by the colors, where yellow represents a round yellow (both dominant genes) phenotype, green representing a round green phenotype, orange representing a wrinkled yellow phenotype, and blue representing a wrinkled green phenotype (both recessive genes).

Retrieved from "http://en.wikipedia.org/wiki/Dihybrid_cross"


monohybrid cross, in genetics, is the mating between two heterozygous individuals. Generally, dominant characteristics are represented with a capital letter, A, and recessive characteristics are represented by a lower case letter, a.


[edit] Monohybrid Cross in Punnet Square
B b
B BB Bb
b Bb bb

The above table crosses two heterozygous genotypes - offspring of the parent homozygous generation in a monohybrid cross are all heterozygous, so for a monohybrid cross, this is an F1 generation cross. The result is a 1:2:1 genotypical ratio, and a 3:1 phenotypical ratio.


[edit] Usage of Monohybrid Cross
Generally, the monohybrid cross is used to determine the F2 generation from a pair of homozygous grandparents (one grandparent dominant, the other recessive) which results in a F1 generation that are all heterozygous. The pairing of these offspring results in a monohybrid cross and results in the F2 generation, with a 75% chance for the dominant phenotype and a 25% chance for the recessive phenotype.