*Genes A and B are linked. Individual plants homozygous for different combinations of these genes (AABB, aabb, AAbb, aaBB) were crossed at random to produce Fi plants. The Fi plants were self pollinated to produce the F2. The F2 progeny from six of the F₁ self pollinations are listed below. F₁ Plant 1 2 3 4 S 6 2. 3. Number of F₂ plants in each phenotypic class AB Ab aB 98 4. 64 106 50 99 10 34 25 8 104 23 31 ab 32 18 a. Determine the genotype of the F₁ that produced each F2 population. 1. 36 2 5. 6. b. Calculate the recombination frequency between genes A and B. I
Genetic Variation
Genetic variation refers to the variation in the genome sequences between individual organisms of a species. Individual differences or population differences can both be referred to as genetic variations. It is primarily caused by mutation, but other factors such as genetic drift and sexual reproduction also play a major role.
Quantitative Genetics
Quantitative genetics is the part of genetics that deals with the continuous trait, where the expression of various genes influences the phenotypes. Thus genes are expressed together to produce a trait with continuous variability. This is unlike the classical traits or qualitative traits, where each trait is controlled by the expression of a single or very few genes to produce a discontinuous variation.
 alt="*Genes A and B are linked. Individual plants homozygous for different combinations of
these genes (AABB, aabb, AAbb, aaBB) were crossed at random to produce Fi plants. The
F₁ plants were self pollinated to produce the F2. The F₂2 progeny from six of the F₁ self
pollinations are listed below.
F₁ Plant
1
2
3
4
S
2.
Number of F₂ plants in each phenotypic class
AB
Ab
aB
98
10
34
3.
64
106
50
99
25
8
104
23
31
a. Determine the genotype of the F₁ that produced each F2 population.
1.
ab
32
18
MacBook Pro
36
2
5.
6.
b. Calculate the recombination frequency between genes A and B.
100
Linkage Problem Set
13. Assume that height and eye color are inherited as follows. T- tall, t- short and B- blue, b-
brown. Genes T and B are linked on chromosome 1, 20 map units apart. A tall brown eyed
woman marries a short blue eyed man. They have a son that is tall and blue eyed. This man
marries a short brown eyed woman.
a. Diagram the arrangement of the alleles on the two chromosome 1's of the tall blue
eyed man.
I
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