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Is crossing over important for the diversity of biological evolution?
The Sexual reproduction and the recombination of linked genes (crossing over) are, along with mutations, the main instruments of biological variability. The Sexual reproduction allows many combinations between genes situated in different chromosomes. The Crossing over, however, is the only means to provide recombination of alleles located in a same chromosome. The Crossing over probably emerged and has been maintained by the evolution because of its importance to biological diversity.
Give the Details of Colour Vision The genes for colour sense are located on the X chromosome (recessive inheritance) and on chromosomes 3 and 7. Changes in the cone pigments as
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In this section, we shall discuss a classic example of natulal selection in action. In the preceding unit, it was stated that natural selection always aims at eliminating alleles,
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Evolutionary relationship among various animal groups is depicted in the cladogram given below. P, Q and R respectively shown: a. Vertebrae, hair and four limbs. b. B
A woman who is heterozygous for a particular X-linked recessive trait marries a phenotypically normal man. What percentage of their sons will show the recessive phenotype?
A dihybrid cross yields 320 F2 offspring. How many are expected to resemble the homozygous recessive parental?
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