Two genes R and Y are located very close on the chromosomal linkage map of a maize plant. When RRYY and rryy genotypes are hybridised, the F2 segregation will show: from Biology Principles of Inheritance and Variation Class 12 Nagaland Board
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Principles of Inheritance and Variation

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12

Two genes R and Y are located very close on the chromosomal linkage map of a maize plant. When RRYY and rryy genotypes are hybridised, the F2 segregation will show:

  • higher number of the recombinant types.

  • segregation in the expected 9 : 3 : 3 : 1 ratio

  • segregation in 3 : 1 ratio

  • higher number of the parental types.


D.

higher number of the parental types.

Law of independent assortment does not applicable when the gene of different character occupy on the same homologous chromosome i.e., linked gene.

Law of independent assortment does not applicable when the gene of different character occupy on the same homologous chromosome i.e., linked gene.

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What for symbols AA and Aa stand ?

AA : Homozygous dominant, Aa : Heterozygous dominant.
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Name one trait that does not blend.

Sex trait .
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Mention the phenomenon of pleiotropy by giving an example.

Pleiotropy. When one gene controls more than one phenotypic character it is termed as pleiotropy.

Example : Sickle cell anaemia.

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Give one example of genetic trait for each of the following in humans : (i) Lethality (ii) Multiple allelism.

(i) Lethality : Sickle cell anaemia.

(ii) Multiple allelism : ABO blood groups.

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Name the plant that shows incomplete dominance in respect of the colour of its flower.

The plany which shoes incomplete dominace in respect of the colour of its flower is -

Snapdragron ( Antirrhinum majus)

Or 

Mirabilis jalapa (Four-O- Clock plant ).
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