To determine whether a particular trait is autosomal or sex-linked, scientists or breeders would perform reciprocal crosses. In a species of exotic bird, the wild-type glossy green is dominant over the yellow plumage. Assigning Ye+ to the wild type glossy green and Ye to yellow, show how you would perform such a cross (or crosses) to test the hypothesis that these plumage phenotypes in this exotic bird are sex-linked. What are the expected phenotypic ratios of the F2, after intercrossing the F1 in each case, if this trait is indeed sex linked?

Q: Tall Tt Gametes Tt F₁ generation T Fertilization Tt t Tall tt Short Tt Tall tt tt Short Conclusion…

A: Backcross is a type of cross in which F1 generation is crossed with recessive parent.

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Q: You have a purple-flowered pea plant, but you do not know if it is homozygous (PP) or heterozygous…

A: The P allele encodes purple flower. This allele is dominant over p allele. The pp encodes white…

Q: A cross in Drosophila melanogaster involved the recessive X-linked genes for white eye (w), yellow…

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Q: Stem length in plants is controlled by two CODOMINANT alleles of one autosomal - one allele, B, adds…

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Q: All crosses involve many more than one character. So far, only one character has been examined to…

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Q: A researcher crosses mice with apricot eyes and long tails, and the F1 progeny were recovered in the…

A: Null hypothesis - The expected ratio is 9:3:3:1 for F2 generation.

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Q: Wild-type mice have brown fur and short tails. Loss of function of a particular gene produces white…

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Q: A is dominant over a and B is dominant over b. Genes A/a and B/b assort independently. The parental…

A: AAbb X aaBB  F1:-    Ab Ab aB AaBb AaBb aB AaBb AaBb

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Q: In corn, two independent, recessive nuclear genes, japonica (j) and iojap (ij), produce variegation…

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Q: (D) To determine the recombination frequency between these 2 genes, you perform several crosses,…

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Q: In roses, purple flower color is determined by the dominant P allele, while pp homozygotes are…

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Q: 4) The round pea seed allele (R) is dominant, while the wrinkled pea seed allele (r) is recessive. A…

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Inheritance and Mendelian Genetics

Inheritance means the passing of traits to offspring from parents. These traits could be passed either through asexual reproduction or sexual reproduction. The offspring receives the genetic material from the parents. Mendelian inheritance is a certain biological inheritance that follows the rules and principles laid down by Gregor Mendel in 1865. The initial hypothesis was considered wrong, but other inheritance theories modified the concept of inheritance and thus genetics.