Chapter 22 - Variation and Genetics - 8

Biology Class 12
1. The locus for H gene is on chromosome 9.


2. Genes that affect growth rate in human also influence skin tone and hair colour.


3. Genes for colour blindness, haemophilia, gout etc. form one linkage group on human X-chromosome.


4. Crossing over is an exchange of segments between non-sister chromatids of non homologous chromosomes during meiosis.


5. The recombination frequencies can be calculated by back crossing the heterzygous to a homozygous double recessive.


6. In Drosophila male is heterogametic because it has only one type of sperms.


7. Correns (1907) discovered that pollens of certain plants were sex determining.


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