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Genetics Practice Test
- Define these words: alleles, chromosome, dominant trait, F1 generation, F2 generation, gamete, genome, genotype, heterozygous, homozygous, hybrid, parent generation, phenotype, recessive trait, somatic cell, trait, pure-bred, incomplete dominance, codominance, multiple alleles, epistasis, pleiotropy.
- Give an example using "lettered alleles", i.e. Tt, of these genotypes: homozygous dominant, homozygous recessive and heterozygous.
- How do you get a line of purebred plants?
- Describe Mendel's three laws.
- Describe three hypothetical plant breeding experiments as examples of Mendel's laws.
- Use lettered alleles or Punnett squares to illustrate the above experiments.
- What are the phenotypic and genotypic ratios for a single trait cross of heterozygous individuals?
- What are the phenotypic ratios for a dihybrid cross of heterozygous individuals?
- Type AB blood is an example of which Mendelian genetics variation?
- In humans, brown eyes are usually dominant over blue eyes. If a blue-eyed man marries a brown-eyed woman, what proportion of their children would you predict will have blue eyes?
- In short horn cattle, a red bull (CR) is crossed with a white cow (CW). The offspring are roan, intermingled red and white hairs. What do we call this variation of Mendelian genetics?
- Tall tomato plants are produced by the action of a dominant allele (T) and dwarf plants by its recessive allele (t). Hairy stems are produced by a dominant allele (H) and hairless stems by its recessive allele (h). A TtHh plant is crossed with a TThh tomato plant. Describe the phenotypic ratio in this dihybrid cross.
- Describe the genotypic ratio in this dihybrid cross.
- What are the chances of the above cross producing tall, hair-less plants?