Question

7. Test cross involves
(a) crossing between two F, hybrids
(b) crossing the F, hybrid with a double
recessive genotype
les crossing between two genotypes with
dominant trait
(d) crossing between two genotypes with
recessive trait​

Answer 1

Answer:

In a test cross, the F1hybrid is crossed with a double recessive genotype. In testcross - the organism with the dominant trait is always crossed with an organism with the recessive trait. If any offspring show the recessive trait, the unknown genotype is heterozygous. If all the offspring have the dominant trait, the unknown genotype is homozygous dominant. Large numbers of offspring are needed for reliable results.

So the correct option is 'The F1 hybrid with a double recessive genotype'.

Explanation:

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Answer 2

Test cross involves crossing the F1 hybrid with a double recessive genotypes.

Explanation:

• In genetics, test cross was involved.
• It was first introduced by Gregor Mental.
• Test cross involves the breeding of an individual with a phenotypically recessive individual, in order to determine the zygosity of the former by analyzing proportions of offspring phenotypes.
• In simply, test cross is defined as the crossing of F1 hybrid with a double recessive genotypic parent.
• By test cross, the Zygosity either can be heterozygocity or homozygocity of the organism.
• Example of Test cross is we have a purple and white flower and purple colour is represents (P) is dominant to white represents (p) it is recessive.
• A testcross will determine the organism's genotype.

To Learn More...

1.All test cross are back cross but all back cross are not test cross

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2.What could be some weaknesses with using a test cross

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