Select the correct statement from the ones given below with respect to dihybrid cross.  from Biology Principles of Inheritance and Variation Class 12 Nagaland Board
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Class 10 Class 12

Select the correct statement from the ones given below with respect to dihybrid cross. 

  • Tightly linked genes on the same chromosome show higher recombinations

  • Genes far apart on the same chromosome show very few recombinations

  • Genes loosely linked on the same chromosome show similar recombinations as the tightly linked ones.

  • Tightly linked genes on the same chromosome show very few recombinations


D.

Tightly linked genes on the same chromosome show very few recombinations

Recombination is a rearrangement of genes during meiosis so that a gamete contains a haploid genotype with a new a gene combination. Morgan and his group found that when genes were grouped on the same chromosome, some genes were very tightly linked (showed very low recombination), while other were loosely linked (showed higher recombination). 

Recombination is a rearrangement of genes during meiosis so that a gamete contains a haploid genotype with a new a gene combination. Morgan and his group found that when genes were grouped on the same chromosome, some genes were very tightly linked (showed very low recombination), while other were loosely linked (showed higher recombination). 

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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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Name one trait that does not blend.

Sex trait .
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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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What for symbols AA and Aa stand ?

AA : Homozygous dominant, Aa : Heterozygous dominant.
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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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