BIOL 102 Lecture Notes - Lecture 18: Sex Selection, Mendelian Inheritance, Y Chromosome
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Genetics ii simple inheritance and variance from complete dominance: principle of independent assortment in earlier notes. End up with the dominant allele of yellow and smooth. Genes on the same chromosome with the same piece of dna. Genes must be physically close to avoid crossing over. Does not follow principle of independent assortment. There is a region of homology at the end of the chromosome that allows the two chromosomes to link up and cross. In humans, x chromosome is larger and carries more genes than the y. Genes found on the x but not the y are x-linked genes. Sex linked genes are found on one sex chromosome but not the other. Assuming there are no other genetic factors affecting gender selection. Family trees are used to analyze human crosses that already exist. Inherited trait is analyzed over the course of generations in one family. The genetic relationships among the individuals in a family.
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According to the multiplication rule of probability, the chance of crossing two pea plants that are heterozygous for height and have none of four offspring showing the recessive short phenotype is:A. ¼ à ¼ à ¼ à ¼. B. ¾ à ¾ à ¾ à ¾. C. (¼ à ¼ à ¼ à ¼) + (¾ à ¾ à ¾ à ¾). D. ¼ + ¼ + ¼ + ¼. E. None of the above. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Females inherit X-linked traits from their maternal parent only. | ||
Females can inherit a gene for an X-linked trait from either parent. | ||
Males inherit X-linked traits from their paternal parent only. | ||
Males can inherit a gene for an X-linked trait from either parent but normally inherit it from their fathers. |
Males can inherit a gene for an X-linked trait from either parent but normally inherit it from their fathers. |