Question

ifba man that is homozygous dominant for unattached earlobes and a woman that us heterzygous for unattached earlobes haveba child what is the likelihood of this child having attached ear lobes(%)

describe the role of the messenger RNA (mRNA) in protein synthesis.

What are homologous chromosomes and what do they have in common? how many homologous pairs do we have in each of our body cells

Answer 1

1) Homologous condition be AA, heterozygous be AA and recessive homozygous be aa.

Then, parents - (male) AA × Aa (female)

Progeny genotype possible - AA, Aa. Only in 1:1 ratio. In neither of the case the child will have attached earlobes. So, answer will be 0%.

2)mRNA is the messenger of Genetic information in the genes. It is transcribed from the dna and using this mRNA the proteins are synthesise by the ribosomes using codon , anticodon pairing and protein synthesis by process of translation.

3) Homologous chromosomes are those which have same genes on same loci and with same morphology and structure. One of the chromosome from homologous pair comes from mother and other from father.

We have 23 pairs of homologous chromosomes.