Question

homework - dna
a passerby notices a mother and a new baby and notes how much the baby resembles the mother. what is a logical biological explanation for this resemblance?
the baby has inherited half of its chromosomes from its mother and is expressing the genes that are part of these chromosomes.
the baby has inherited all of its chromosomes from its mother and is expressing the genes that are part of these chromosomes.
the baby has inherited half of its genes from its mother and is expressing the chromosomes that are part of these genes.
the baby has inherited all of its genes from its mother and is expressing the chromosomes that are part of these genes.

Explanation:

In sexual reproduction, offspring inherit half of their chromosomes from the mother and half from the father. Genes on these chromosomes determine traits. So, the baby inheriting half of its chromosomes from the mother and expressing genes on those chromosomes can lead to resemblance.
The second option is wrong as baby doesn't inherit all chromosomes from mother (father contributes half). The third and fourth options have incorrect relationship - genes are on chromosomes, not chromosomes on genes.

Answer:

The baby has inherited half of its chromosomes from its mother and is expressing the genes that are part of these chromosomes.