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Mendel and Monohybrid crosses

Mendel and Monohybrid crosses. _____________. _________________________. Independent assortment. states that ___________pairs separate independently during the formation of ____________. This means that traits are transmitted to offspring independently of one another. Possible Genotypes.

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Mendel and Monohybrid crosses

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  1. Mendel and Monohybrid crosses

  2. _____________

  3. _________________________

  4. Independent assortment • states that ___________pairs separate independently during the formation of ____________. This means that traits are transmitted to offspring independently of one another.

  5. Possible Genotypes • An individual can be; • Homozygous (pure bred): 2 of the same alleles • Homozygous _______________ RR (red) • Homozygous _______________ rr (orange) • Heterozygous (hybrid): 2 different alleles • Heterozygous Rr (Red)

  6. Genotype vs. Phenotype • Genotype: the ____________makeup of an individual that indicates the specific copies of alleles present for a particular trait. • The flower can be heterozygous (Rr), homozygous dominant (RR) or homozygous recessive (rr). • Phenotype: the way an individual ______________as a results of the genes expressed. • Ex. Flower can appear RED (RR or Rr) or ORANGE (rr).

  7. Example: 1. A cross between a pea plant that is heterozygous for purple flowers (Pp) is crossed with a pea plant with white flowers (pp). Determine the genotypes and phenotypes of the possible offspring.

  8. Making a Punnet Square • State the parent generation and the possible gametes • Ex. P: Pp X pp Gametes: parent 1 – P, p ; parent 2: p, p • Draw the Punnet square using a ruler!

  9. Making a Punnet Square • Write the possible gametes • Fill in the punnet square by combining alleles • Recall P: Pp X pp Parent 1 P p Gamete p p Possible genotype of offspring Parent 2

  10. Genetic Crosses • Determine the genotype and phenotype • Answer the question (As a ratio or percentage). As a ratio: G:_____________________________ Ph: ____________________________ As a percent: G: _________________________ Ph: ________________________

  11. Example 2: • In guinea pigs a black coat (B) is dominant over a white coat (b). Determine the phenotype and genotype ratios if a homozygous dominant parent is crossed with a heterozygous parent.

  12. P: ___________________ Gametes: __________________ F1: G: ______________________

  13. Example 3: • In humans, free ear lobes (F) are dominant over attached ear lobes (f). What are the phenotype and genotype ratios of the offspring: • When a homozygous dominant female is crossed with a homozygous recessive male • Based on these results, what is the chance (percentage)of the child having attached ear lobes • What is the phenotype of the F2 generation

  14. P: __________________ P: ___________________ • Gametes: ____________ Gametes: ______________ F1 F2 • G: ______ G: _______________ • Ph: ___________ Ph: ________________ b) ________________

  15. Example 4 • In unicorns, a large horn (H) is dominant over a small horn (h). • If two heterozygous parents are crossed, what are the phenotypic and genotypic ratios of the F1 generation. • How many offspring will be born with a small horn if the parents have 100 offspring.

  16. P: _____________________ • Gametes: ____________________ • G: ______________________ Ph: ______________________ • _________________________

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