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Segregation of mendelian factors (As) occurs during
A. Diplotene
B. Anaphase I
C. Zygotene/Pachytene
D. Anaphase II

Answer
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Hint:
Now we are going to discuss the topic of Mendelian factors.
Genes alone are mendelian factors. Mendel coined the term "factors" to describe the units that code for these qualities when he conducted his experiment on the inheritance of traits (characteristics). These elements were then given the name genes.

Complete step by step answer:
According to Mendel's chromosomal theory of inheritance, certain genes are transmitted from one generation to the next in opposing pairs on homologous chromosomes. Mendelian factors were a name given to the genes. The unit of inheritance that a gamete carries is called a gene. In conjunction with other genes and the environment, a gene found in a chromosome regulates how a character is expressed. A cistron, or section of DNA, that has a specific purpose, is a chemical gene. One cistron regulates the synthesis of one polypeptide.
Both a recessive and a dominant allele can be found in the majority of genes. The person is said to be homozygous for the characteristic if both alleles are identical. An individual is referred to as heterozygous if both alleles are different. An allele's presence does not guarantee that the characteristic (character) will manifest in the person who possesses it. The dominant allele is the only one expressed in heterozygous people. Although it is also present, the recessive allele does not express itself. The several alleles that each individual contains determine its genotype.
Therefore, the Segregation of mendelian factors (As) occurs during Anaphase I.

Option ‘B’ is correct

Note:
Both an individual's genes and their environment play a role in determining their phenotype, or outward look. Genes are functional DNA units. A gene's location (locus) on a chromosome is fixed. It comprises a specific set of instructions, which typically codes for a certain protein or function.