science
Grade-10
Easy
Question
Chromosome A includes genes for an eye color of black.
Chromosome B comprises genes for hair color of black, and
Chromosome C has genes for an eye color of grey.
- A and B are homologous chromosomes.
- Homologous chromosomes are B and C.
- A and C are homologous chromosomes.
- Not a single chromosome are homologous to each other.
Hint:
Homologous chromosomes have genes coding for same trait at same loci.
The correct answer is: A and C are homologous chromosomes.
- Homologous chromosomes posses approximately same length with same position of centromere
- A pair of homologous chromosomes have genes coding for same trait at same loci or position
- For example, in chromosome 15 OCA2 gene is responsible for eye color
- If a pair of chromosome is given and the eye color is produced by same OCA2 gene, they are called homologous chromosomes
- The alleles of the gene need not be same
- As given, the chromosome A and C code for same gene with different allele
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