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Nondisjunction may occur due to the failure of ______ chromosomes to separate properly in meiosis I.

Defective
Heterozygous
Homologous
Autosomal
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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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Which one of the followings is assigned an uppercase letter?

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

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