Questions and Answers

What is crossing over? Give its significance.

What is recombination frequency?

Explain how Bridges’s study of non disjunction in Drosophila helped prove the chromosome theory of inheritance.

How did nondisjunction experiments help to prove the chromosome theory of inheritance? Drosophila in which nondisjunction was seen were more likely to have wild type phenotypes than others. b) Bridges isolated genetic mutants of eye color and was able to sequence the mutants. c) The results of nondisjunction were seen on d) Bridges isolated exceptional Drosophila offspring with extra or missing chromosomes and was able to analyze the phenotypes based upon these genotypes. e) Bridges isolated Drosophila with no X chromosome and was able to identify the phenotypes. What is the phenomenon hyperactivation? When a gene is overexpressed in the homozygous dominant. b) In incomplete dominance, the homozygous dominant has a more intense phenotype than the heterozygote. c) In male mammals, when the genes on the chromosome are upregulated in such a way as to match the expression from the two chromosomes in the female. d) When a gene is overexpressed in response to a disease state. e) In male Drosophila, when the genes on one chromosome are upregulated in such a way as to match the expression from the two X chromosomes of the Drosophila female. What is the chromosomal ratio required for wild type male Drosophila to develop? 2X:LY IXZA 2Xila 0.5X:LY IX:1Y