The figure that follows contains ball-and-stick drawings of three possible shapes of an AF4 molecule. (a) For each shape, give the electron-domain geometry on which the molecular geometry is based. (b) For each shape, how many nonbonding electron domains are there on atom A? (c) Which of the following elements will lead to an AF4 molecule with the shape in (iii): Be, C, S, Se, Si, Xe? (d) Name an element A that is expected to lead to the AF4 structure shown in (i).
MMBIO 240 Week 1 (08/29/16 – 09/02/16) Ch. 2.1 Mendelian Genetics -Genetics is the study of heredity and variation of inherited traits Key Terms A Geneis a specific portion of DNA that codes for a certain protein or RNA An Allele is a variation of a specific genethat codes for a specific trait The alleles thatanorganism possesses areknown as it’s Genotype The genotype influences the Phenotype(outward appearance) of anorganism Most genes contain two alleles thatmake a pair. Homozygousgenes containtwo matching alleles.Heterozygousgenes containtwo different alleles. A Dominant Allele is expressedinthe phenotype of a heterozygous organism. A Recessive Allele is not expressed (though present) in the phenotype of an organism -Gregor Mendel is famous for his heredity research on pea plants in the 1850’s 2 Mendelian LawsofHeredity 1. Lawof Segregation-Allelepairs separateduring gamete formation 2. Lawof Independent Assortment-Separategenes assortindependently of each other during gamete formation Exceptionsto Mendelian Laws IncompleteDominance-Heterozygous allelepairs produce a phenotype that appears to be a mix of the dominant and recessivetraits (Red +White=Pink) Codominance-Multipletraits canbe expressedat the same time (AB Blood) Linked Genes – Two genes that are relatively closed to each other on the same chromosome, and cannot separate from each other during gamete formation, and will typically be inherited together, however, they may be separated by recombination during meiosis CH.2.4 Molecular Genetics Howwas DNA proven to bethegene