#Question id: 4897
#Unit 8. Inheritance Biology
When two independent pure lines AAbb and aaBB of pea with white flowers are crossed, the F1 progeny has purple flowers. Gene A and B link at 20 map unit. The following conclusions were made
A. When an heterozygous individual of the genotype AaBb is test crossed, progenies with purple and white in a ratio of 1:3
B. When an heterozygous individual of the genotype AaBb is test crossed, progenies with purple and white in a ratio of 1:9
C. This is an example of complementary gene action
D. The F2 progeny obtained on selfing shows both pruple and white flower in a ratio of 9:7
Which of the following conclusions are correct?
#Question id: 4898
#Unit 8. Inheritance Biology
A three point test cross was carried out in Drosophila melanogaster involving three adjacent genes A, B and C. arranged in the same order. The distance between A to B is 15 map unit (mu) and that between B to C is 30 map. The coefficient of coincidence = 0.67. What is the percentage of double recombinants in the progeny obtained from the testcross?
#Question id: 4899
#Unit 8. Inheritance Biology
In Neurospora a cross between the genotypes 'A' and 'a' results in an ascus with ascospores of genotypes as shown below:
|
Ascus Class |
Ascospore |
||||||||
|
I |
A |
A |
A |
A |
a |
a |
a |
a |
|
|
II |
A |
A |
a |
a |
a |
a |
A |
A |
|
Statements A to D are events that could have occurred during meiosis.
A) Class I is results of no crossing over between the centromere and gene.
B) Class II is results of single crossing over between the centromere and gene
C) Class I shows segregation of alleles 'A' and 'a' in meiosis II
D) Class II shows segregation of alleles 'A' and 'a' in meiosis II
#Question id: 4900
#Unit 8. Inheritance Biology
The chlorophyll-deficient types occur in a particular plant species due to a mutation in the DNA of the chloroplast itself, Female cytoplasm chlorophyll-deficient organisms crossed with male normal chlorophyll will produce progeny
#Question id: 4900
#Unit 8. Inheritance Biology
The chlorophyll-deficient types occur in a particular plant species due to a mutation in the DNA of the chloroplast itself, Female cytoplasm chlorophyll-deficient organisms crossed with male normal chlorophyll will produce progeny
#Question id: 4901
#Unit 8. Inheritance Biology
Assume that the alleles A (dominant) and a (recessive) show a maternal effect mode of inheritance. In a cross between an Aa female and an aa male, what would be the phenotypes of the progeny?