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Biology
9. Heredity and Evolution
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Q5 of 85 Page 288

Which statement about the genotypes of organisms is correct?

Allele which can express themselves in heterozygous conditions are dominant alleles while which does not are recessive allele.


Due to this reason, recessive allele is able to express themselves in a homozygous condition only.


TT has a phenotype of tall height & Tt also has a phenotype of tall height but tt is for short height.

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When a breed of cattle with red coats is crossed with the same breed with coats, the offspring all have coats with a mixture of red and white hairs, a condition called roan. If roan cows were crossed with a red- coated bull, the theoretical ratio of the offspring would be

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Which statement is true for a dominant allele?

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A farmer saves the seeds from his best maize crop plants to sow for next year’s crop.

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What is a result of natural selection?

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9. Heredity and Evolution
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