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12 Dec 2019

Mendelian Genetics problems:

1)

What are the probabilities of a particular genotype or phenotype for an offspring for the following parental genotypes?

a. Monohybrid cross if one parent is homozygous recessive and one parent is homozygous recessive? What if both are heterozygotes?

b. Dihybrid cross if one parent is homozygous recessive and one parent is homozygous recessive? What if both are heterozygotes?

2)

What are the probabilities that two parents with the genotypes AaBbccDD x AabbCcDd will have an offspring with the genotype AAbbCcDD?

What about the phenotype aBcD?

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Related questions

7- If G=yellow seeds and g=green seeds, predict the genotypic and phenotypic ratios of a cross between a) two Gg individuals; b) a Gg and a gg. If cross 'a' gives you 2/3 offspring that are yellow and 1/3 that are green, what is the mode of inheritance and what is the genotype of the yellow offspring?

8- For four genes (all autosomal recessive), beginning with a AaBbCcdd x aabbCcDd cross, what is the probability of producing a child in the F1 with the A- bb C- dd phenotype?

9- For three autosomal dominant genes, what is the probability that a cross between two heterozygotes (i.e. AaBbCc x AaBbCc) will produce an offspring with the dominant trait for all genes?

Which of Mendel's findings provided the best evidence for the principle of independent assortment?

A tall plant and dwarf plant will produce all tall offspring.

Homozygous recessive traits are always rare.

A dihybrid cross will result in non-parental phenotype combinations (not seen in original P generation)

A monohybrid cross will result in a 1:2:1 genotype ratio.

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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