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3 Apr 2018

If a tetrahybrid is test crossed (i.e. crossed to a homozygous recessive individual aabbccdd), what is the probability that a phenotypically recessive individual offspring will be produced?

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Related questions

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 _____________

1.InDrosophila (fruit fly) ebony is a recessive mutant causingblack body color when homozygous, as opposed to the normal tancolor.


  1. If an ebonycolored male is crossed to a homozygous tan female, what will bethe color of the offspring?
  2. If theF1 males and females are crossed, what phenotypes can beexpected to appear in the F2 and in whatproportions?
  3. If anF1 male is crossed to an ebony female, what kinds ofprogeny will be produced and in what proportions.


A male mouse that is homozygous recessive for the BIG gene (bb) is crossed to a homozygous dominant female mouse (BB). The offspring are all small.
In a reciprocal cross, a homozygous recessive female mouse (bb) is crossed to a homozygous dominant male mouse (BB). This time the offspring are all big.

(a) What are the genotypes of the offspring in each cross?

(b) These crosses demonstrate which inheritance pattern: x-linked inheritance, imprinting, dosage compensation, or cytoplasmic inheritance?

(c) Explain why the phenotypes of the offspring are different in the two crosses.

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