1) For a dihybrid test cross, the expected ratio is 1:1:1:1. So, the ratio expected for aB will be (100/4) = 25
2)
Null hypothesis: Ho: The population is assorting independently.
Alternate hypothesis: H1: The population is not assorting independently.
Please note that test cross expected phenotypic ratio should be 1:1:1:1 in case of independent assortment (part ‘b’. Here, this is not the case.
Observed |
Expected |
(O-E)^2 |
(O-E)^2/E= chi square value |
|
AB |
22 |
25 |
9 |
0.36 |
Ab |
28 |
25 |
9 |
0.36 |
aB |
29 |
25 |
16 |
0.64 |
ab |
21 |
25 |
16 |
0.64 |
Total |
100 |
2 |
Calculated value = 2 (chi-square value)= Answer 2
Degree of freedom = (rows-1) (columns-1) = (4-1)* (4-1) = 9
The value for 9 degree of freedom is not given in the table. So, cannot be calculated from your table.
From internet resources,
Tabulated value = taken from chi square table = 16.91
Level of significance (given) = 0.05
Null hypothesis is accepted if calculated value is less than tabulated value.
Here, tabulated value>calculated value, so, null hypothesis should be accepted.
So, the population is assorting independently.
You test-cross plants you suspect to be AaBb dihybrids and look at 100 offspring, with the...
A dihybrid test-cross, involving parents with the phased genotypes of Ab/aB and ab/ab, produced 100 offspring. Assuming that genes A and B are located on one or more autosomes and 10 of the offspring inherited the aabb genotype. What is the most likely genetic distance between genes A and B? Answer= 20cM Please Explain Why! Thanks
Prophese tolmeiosis At any time throughout division Question 4 A test cross of AaBb x aabb yields the following babies: 35% babies with AB phenotype 35% babies with ab phenotype 15% babies with Ab phenotype 15% babies with a phenotype Which of the following conclusions is correct? The A and genes are located on different chromosomes The A and B genes are located 70 map units apart on the same chromosome The Aand geves are located 35 map units apart...
A testcross with a heterozygote b+bc+c produces a total of 700 offspring. The following are the resulting phenotypes of the progeny and corresponding numbers: b+c+ = 270; bc = 255; b+c=83; bc+=92 1) Based on the data, do the genes b and c appear to be linked or are they assorting independently? How did you determine your answer? If the genes are linked, which of the above genotypes are the non-recombinant progeny? Also, is the original configuration of the loci...
You obtained F1 from a cross of AABB X aabb. F1 produced the following number of gametes AB: 36 ab: 28 Ab: 14 aB: 18 To test whether A and B gens are linked or not, calculate chi-square value. Please work out and explain each step!
A cross was made between two strains of plants that are agriculturally important. One strain was disease-resistant but herbicide-sensitive; the other strain was disease-sensitive but herbicide- resistant. A plant breeder crossed the two plants and then allowed the F1 generation to self-fertilize. The following data were obtained: F1 generation: All offspring were disease sensitive and herbicide resistant. F2 generation: 170 disease sensitive, herbicide resistant 60 disease sensitive, herbicide sensitive 44 disease resistant, herbicide resistant 10 disease resistant, herbicide sensitive Formulate...
CILE WIL Genetics Including Use o n 1. You are Gregor Mendel and you ar smoothness. R is the dominant allele an recessive and plants that are I have wrinkled pea seeds. Gregor Mendel and you are studying PEAS You are focusing on the R gene ittle "r" is nant allele and is associated with smooth besed phenotype. Little on the R gene which controls You have these plants: RR (smooth peas) a generation. ese plants: RR (smooth peas) and...
5. In Mendel's experiments, the pod color gene and the seed shape gene were located on different chromosomes (in other words, they were not linked. They assort independently). Green pods (G) are dominant over yellow pods (g) and tall stems (T) are dominant over dwarf stems (t). You are given two true breeding plants (homozygous at both genes). In the parental (P) generation, one parent has green pods and dwarf stems and the second parent has yellow pods and tall...
You observe a "parental" generation cross: NNHH times nnhh. The offspring of that cross are called the "F1" generation. F1 individuals are then crossed with the genotype nnhh.(i.e., a "testcross"). Suppose you count 1000 offspring of the testcross and find the following results: 430 offspring with four fingers on small hands 450 offspring with four fingers on large hands 62 offspring with four fingers on large hands 48 offspring with four fingers on large hands 58 offspring with four fingers...
In a flowering plant, red flowers are dominant over white flowers, and short plants are dominant over tall plants. A short plant with red flowers was self-fertilized and the phenotypes for the resulting progeny recorded (see below). Based on the observed numbers, you propose the hypothesis that this dihybrid cross follows a 9:3:3:1 phenotypic ratio, whereby Mendel's laws apply. Based on this hypothesis, you calculated the expected number of progeny for each phenotype (see below). Phenotype Observed Number of Plants...
1. Define deletion, duplication, inversion and translocation and give examples (6 points) 2. A diploid corn plant has 12 chromosomes. How many total chromosomes would you expect in the following com plants? (3 points) A. Trisomy 7 = B. Tetraploid = C. 3n- D. Monosomy 5 = E. 4n+1 = F. Trisomy 1 and Monosomy 2 = 3. Describe two different experimental strategies to create an allotetraploid from two different diploid species of plants (4 points) 4. Three genes are...