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when examining sutton s drawings of chromosomes of the grasshopper brachystola magna 3651148

When examining Sutton’s drawings of chromosomes of the grasshopper, Brachystola magna, Eleanor Carothers (1913) noted a pair of unlike chromosomes—one large dyad and one small dyad—making up a tetrad in each of 300 primary spermatocytes. In addition, an accessory chromosome (unpaired and later called the X chromosome) was identified in females, such that males had 23 chromosomes and females had 24 chromosomes. Carothers found that the larger dyad in each unlike pair went to the same pole as the accessory chromosome in 154 anaphases, while the smaller dyad went with the accessory chromosome in the remaining 146 anaphases. (a) How do these findings relate to Mendel’s postulates, and (b) how do they support the chromosome theory of heredity?

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