Question

(3) If a cross betweer TtRr with(ttrr)give 125 proqeny with Ttrr genotype of 1000 progeny than distance between T and R is - (1) 12.5 map unit (2) 125 map unit (3) 25 map unit (4) 50 map unit​

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CBSE

Biology

Grade 10

Mendelian laws of inheritance

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Due to the cross between TTRr and ttrr the resultant progenies showed how many percent plants would be tall, red-flowered?

(a)50%

(b)75%

(c)25%

(d)100%

Answer

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Hint: When two parents differing from each other in two or more pairs of contrasting characters are crossed, then the inheritance of one pair of characters is independent of the other pair of characters.

Mendel proposed “the law of independent assortment” which tells us that in a dihybrid cross, the segregation of one pair of traits is independent of the other.

Complete step-by-step answer:

Let the gene for the tall habit of a plant be represented by ‘T' and dwarf habit is represented by ‘t’. Let the gene for red-flowered be represented by ‘R' and that of white-flowered be represented by gene ‘r’. Then, the genotypes of the parents would be Heterozygous tall, red-flowered- TTRr and Homozygous dwarf, white-flowered – ttrr.

Phenotypes of parents – Tall red × Dwarf white

Genotypes of parents – TTRr × ttrr

Gametes – TR, Tr, tr, tr

F1 generation -

(here u r supposed to draw the diagram in the above image)

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