#Question id: 29101
#Unit 8. Inheritance Biology
A cross between two yellow heterozygous mice produces an initial genotypic ratio of 1/4 YY, 1/2 Yy, and 1/4 yy, the F1 progeny showing lethality in their ratio, if F1 yellow heterozygous mate with nonyellow mice what will be the ratio in F2 generation?
#Question id: 29102
#Unit 8. Inheritance Biology
In mice Igf2 gene which encodes a protein called insulin like growth factor II (Igf2). Offspring inherit one Igf2 allele from their mother and one from their father The paternal copy of Igf2 is actively expressed in the fetus, but the maternal copy is not expressed. which of the following is correct about this gene?
a) this is an example of genomic imprinting and showing maternal imprinted
b) this is an example of genomic imprinting and showing paternal imprinted
c) mechanism of imprinting is due to the addition of methyl (CH3) groups to DNA nucleotides
d) mechanism of imprinting is due to changing the nucleotide sequences
#Question id: 4799
#Unit 8. Inheritance Biology
You set up a mapping cross involving your favorite gene (YFG) in Neurospora and determine the following octad types: 4:4 arrangement 83; 2:4:2 arrangement 7; 2:2:2:2 arrangement 10. What is the distance between your gene and the centromere?
#Question id: 4800
#Unit 8. Inheritance Biology
You set up a mapping cross involving two genes of interest in Saccharomyces and determine the following tetrad types: 8 nonparentalditype; 12 tetratype; 80 parental ditype. Calculate the most accurate map distance between these two genes.
#Question id: 4801
#Unit 8. Inheritance Biology
You set up a mapping cross involving two genes in Aspergillus and determine the following percentages of tetrad types: parental ditype 51%, nonparentalditype 49%. What can you say about your genes?
#Question id: 4802
#Unit 8. Inheritance Biology
Why is tetrad analysis useful for studying genetics?