What is the homozygous dominant genotype?
An organism with two dominant alleles for a trait is said to have a homozygous dominant genotype. Using the eye color example, this genotype is written BB. An organism with one dominant allele and one recessive allele is said to have a heterozygous genotype.
Is F2 generation homozygous?
The second filial (F2) generation cross of true breeding parental groups yields a 1:2:1 ratio, where 25% of the time offspring will be homozygous dominant, 50% of the time, they will be heterozygous, and 25% of the time they will be homozygous recessive.
How many total gene pairs are involved in the inheritance of both eye color and croaking?
According to the obtained relationships one would conclude that croaking is due to ONE GENE PAIR, whereas eye color is due to TWO GENE PAIRS. Because there is a 9 TO 4 TO 3 ratio regarding eye color, some gene interaction (a RECESSIVE EPISTASIS) is indicated.
What is the ratio expected for offspring of a cross between two yellow mice?
All testcross data with the yellow mice give a 1:1 ratio. This ratio is typical of what is seen with heterozygous individuals. Therefore, all of the yellow mice from the cross of two heterozygous yellow mice are genotypically Yy.
What heterozygous dominant?
Unlike homozygous, being heterozygous means you have two different alleles. You inherited a different version from each parent. In a heterozygous genotype, the dominant allele overrules the recessive one. Therefore, the dominant trait will be expressed.
Which one of the following is an example of homozygous dominant?
A homozygous dominant genotype is one in which both alleles are dominant. For example, in pea plants, height is governed by a single gene with two alleles, in which the tall allele (T) is dominant and the short allele (t) is recessive.
What is the difference between F1 generation and F2 generation?
What is the difference between the F1 generation and F2 generation? F1 generation is the first filial generation, whereas F2 generation is the second filial generation obtained by crossing the F1 generation.
What is the difference between P1 F1 and F2 generations?
To help with record keeping, generations were labeled and numbered. The parental generation is denoted as the P1 generation. The offspring of the P1 generation are the F1 generation (first filial). The self-fertilizing F1 generation produced the F2 generation (second filial).
Which of the following has dominant allele in both gene locus?
Which one of the following has dominant allele in both gene locus? Explanation: To give an agouti mouse the gene combination should be A/- C/-, so it must have atleast one dominant gene in both the gene locus.
How many gene pairs are involved in the inheritance of cattle coat color?
There are two genes that determine Coat color. 1st gene determines if there is Black or Brown color, Brown being recessive the black. 2nd Gene determines if it will even be brown or black, or just Golden. Golden coat is recessive.
Which allele is dominant?
Dominant alleles show their effect even if the individual only has one copy of the allele (also known as being heterozygous?). For example, the allele for brown eyes is dominant, therefore you only need one copy of the ‘brown eye’ allele to have brown eyes (although, with two copies you will still have brown eyes).
