Individuals with Down syndrome have ______ copies of chromosome 21.
One
Two
Three
Four
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The genetic defect-adenosine deaminase (ADA) deficiency may be cured permanently by |
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When the effects of both alleles are equally expressed in the heterozygote which one of the followings occurs? |
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When a tall plant with round seeds (TTRR) crossed with a dwarf plant with wrinkle seeds (ttrr). The F1 generation consists of tall plants with round seeds. What would be the proportion of dwarf plant with wrinkle seeds in F1 generation? |
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An individual who has two different alleles of a gene is called ______. |
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Nondisjunction may occur due to the failure of ______ chromosomes to separate properly in meiosis I. |
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Haploids are more suitable for mutation studies than the diploids. This is because |
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Which one of the followings is caused by a recessive allele of a gene on chromosome 7? |
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ABO blood groups in humans are controlled by the gene l. It has three alleles – lA, lB and i. Since there are three different alleles, six different genotypes are possible. How many phenotypes can occur? |
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During meiosis I, the ______ chromosomes of each pair come together to lie side by side. |
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______ are heterozygous with regard to only one pair of alleles. |
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