BIOL 111 Lecture Notes - Lecture 23: Dihybrid Cross, Zygosity, Gamete

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salmonshark98

28 Oct 2016

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Chapter 14 - mendel and the gene idea (pt. In pea plants with purple flowers the genotype is not immediately obvious. A testcross: allows us to determine the genotype of an organism with the dominant phenotype, but an unknown genotype, crosses an individual with the dominant phenotype with an individual that is homozygous recessive for a trait. Mendel derived the law of segregation (two alleles separate during gamete formation) by following a single trait. The f1 offspring produced in this cross were monohybrids, heterozygous for one character. Mendel identified his second law of inheritance by following two characters at the same time. Crosses two, true-breeding parents differing in two characters produces dihybrids in the. Produces four phenotypes in the f2 generation. Using the information from a dihybrid cross mendel developed the law of independent assortment each pair of alleles segregates independently during gamete formation. The laws of probability govern mendelian inheritance.

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1. A dominant gene (H) produces wire-haired texture in dogs; its recessive allele (h) produces smooth hair. Two heterozygous wire-haired individuals were crossed and their F1 progeny testcrossed. Determine the expected genotype and phenotype rations among the testcross progeny. Note: in a testcross, an individual with an unknown genotype is crossed with a homozygous recessive individual.

2. A white guinea pig, whose parents were black, is closed with a black guinea pig whose male parent was white and whose female parent was black. Two white offspring result. Determine the genotypes of all individuals mentioned. About which individuals is there some doubt?

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1. A person is described as a carrier for a particular genetic disease. What does this tell you about their genotype?

2. For any given gene, the principle of independent segregation predicts that each gamete produced as a result of meiosis will contain ____________________

3. A pair of alleles is said to be heterozygous when:

4. In a diploid species, cells can have up to ___ alleles of a particular gene.

5. In a cross between a homozygous dominant parent and a homozygous recessive parent, the number of phenotypic classes observed in the offspring is ______

6. For a person of genotype Xx, the genotype of their gametes may be ______________

7. In a "test cross", an individual of unknown genotype is crossed with a ___ individual to determine the unknown genotype.

8. An albino woman has a child with a phenotypically normal man with no family history of albinism (which is a rare recessive disorder). What percentage of their children are likely to be albino?

9. An individual with the dominant phenotype, but an unknown genotype, is test-crossed, and all of the offspring exhibit the dominant phenotype. The genotype of the unknown individual is ______________

10. If two heterozygous individuals for a recessive disease (carriers) have a child, what is the chance that their child will develop the disease?

11. In a monohybrid cross between two true-breeding parents that both exhibit the dominant phenotype, ___ percent of the offspring will exhibit the recessive phenotype.

12. In a particular type of tomato plant, red fruit is dominant over yellow fruit, and dwarf height is a recessive trait. If two heterozygous plants were crossed, what proportion of the offspring would show the dominant phenotype?

13. In a cross between a BbRr individual and a BBRR one, what do the following represent: BR, Br, bR, br?

14. In humans, the gene that determines whether an embryo develops as a male or a female is carried on _____________

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BIOL 111 Lecture Notes - Lecture 23: Dihybrid Cross, Zygosity, Gamete

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