Incomplete-Dominance practice Cladograms gizmos worksheet PDF

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Summary

Cladograms are diagrams which depict the relationships between different groups of taxa called “clades”. By depicting these relationships, cladograms reconstruct the evolutionary history (phylogeny) of the taxa. Cladograms can also be called “phylogenies” or “trees”....

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Mendelian Genetics: “Exceptions”

Name_______________________

1. Explain the difference between incomplete and codominance.

Co-Dominance Problems-Show a Punnett Square for all problems! 2. In some chickens, the gene for feather color is controlled by codominance. The allele for black is B and the allele for white is W. The heterozygous phenotype is known as erminette (black and white spotted). a. What is the genotype for black chickens? ____ b. What is the genotype for white chickens? ____ c. What is the genotype for erminette chickens? ____ 3. If two erminette chickens were crossed, what is the probability that: a. They would have a black chick? ____% b. They would have a white chick? ____% Parents: ____ X ____

4. A black chicken and a white chicken are crossed. What is the probability that they will have erminette chicks? ____% Parents: ____ X ____

In shorthorn cattle, when a red bull (RR) is crossed with a white cow (WW), all the offspring are roan—a spotted, red and white or milky red color. 5. What offspring are expected from mating a roan bull and a roan cow?

6. What phenotypes would you expect from a cross between a red bull and a white cow?

Blood type is controlled by 3 alleles: A, B, O. A & B are codominant, O is recessive. 7. a) What are the two genotypes possible for a person who as A blood? ______________ b) What genotype does a person with AB blood have? _______________ c) What genotype does a person with O blood have? _____________ d) What are the two genotypes possible for a person who as B blood? __________________

8. A man with type AB blood is married to a woman also with type AB blood. What percentage of their children will have: A blood? _______ B blood? ______ O blood _____ AB blood ________ SHOW HOW YOU DETERMINED THIS BELOW

9. A man has type B blood (genotype BB) is married to a woman with type O blood. What blood type will all their children have? ________ What is the genotype of the children? ______ SHOW HOW YOU DETERMINED THIS BELOW

10. A woman with type A blood (genotype AO) is married to a type B person (genotype BO). What proportion of their children will have: A blood? _______ B blood? ______ O blood _____ AB blood ________ SHOW HOW YOU DETERMINED THIS BELOW

11. A woman with type A blood is claiming that a man with type AB blood is the father of her child who is type B.

Could this man be the father of the child? _______________ Show the possible crosses; remember that the woman can have AA or AO genotypes. Assuming that he is the father, what must the mother's genotype be? _____

12. A man with type AB blood is married to a woman with type O blood. They have two natural children and one adopted child. Jane has type A blood, Bobby has type B blood, and Grace has type O blood. Which child was adopted? (show the crosses)

Incomplete Dominance Problems 13. In snapdragons, flower color is controlled by incomplete dominance. The two alleles are red (R) and white (W). The heterozygous genotype is expressed as pink. a. What is the phenotype of a plant with the genotype RR? ___________ b. What is the phenotype of a plant with the genotype WW? ___________ c. What is the phenotype of a plant with the genotype RW? ___________ 14. A pink-flowered plant is crossed with a white-flowered plant. What is the probability of producing a pink-flowered plant? ____% Parents: ________ X ________ SHOW THE CROSS BELOW

15. What cross will produce the most pink-flowered plants? Use a punnett square to support your answer. Parents: _______ X _______

16. In Andalusian fowls, black individuals (B) and white individuals (W) are homozygous. A homozygous black bird is crossed with a homozygous white bird. The offspring are all bluish-gray. Show the cross as well as the genotypes and phenotypes of the parents and offspring.

17. What results if a black individual is crossed with a bluish-gray individual? (SHOW YOUR WORK)

18. If two bluish-gray individuals were crossed, what would be the ratios for both phenotype and genotype of the offspring? *remember to label!! Include your Punnett square below

Phenotypic ratio:

Genotypic ratio:...