Biology Test 18...

What phenotype ratio is obtained by selfing of a trihybrid, in which two gene pairs are completely dominant and one gene pair is incompletely dominant?

Which of the following statement is correct about polygenic inheritance ?

Which one of the following option is not related to quantitative inheritance :-

Two genes 'A' and 'B' are completely linked. In a dihybrid cross involving these two genes, the F₁ heterozygote is crossed with homozygous recessive parental type (aabb). What would be the ratio of offspring in the next generation :-

A normal vision man whose father is colourblind, marry with a normal woman whose father also colourblind. They have their first child daughter then what are the chances that this child would be colourblind?

In an experiment, a plant homozygous for ‘ab’ gene were crossed with wild type. The F₁ hybrid was test crossed and progenies produced in following ratio :

++ / ab → 896    ab / ab → 880
+b / ab → 116    a + / ab → 108
The distance between ‘a’ and ‘b’ gene is :-

In Drosophilla, the following recombinations frequencies were found between the given genes :-

a and b = 2.8%    a and c = 7.8%
b and d = 8.0%    c and d = 3.0%

What is the order of these genes on chromosome?

Haemophilia is more common in males because it is a :-

Chromosomal theory of inheritance was experimentally verified by :-

Genetic maps of chromosomes are based on the frequency of :-