When a child is born with down syndrome, when did the mutation occur?

Which of the following animal pairs would you expect to have the most similar embryonic development

20. What was the purpose of this reaction?

Competitive release is most likely to occur when a

A large sunflower population is established in a field. The flowers mate randomly, and all individuals are equally likely to survive and reproduce.

Which of the following statements is false? a) On average, there is one virus particle for every bacterial cell on earth b) The human body plays host to ten bacterial cells for each one of its own c) Microbial cells have been in existence for at

People generally know that citrus fruits are good food sources of vitamin C, but there are plenty of non-citrus sources as well. What are some of the non-citrus foods are good sources of vitamin C?

what is the presence of different genes on the same chromosome, is it linkage?, diploid?, haploid?, autosome?, or chromosome theory

Which of the following statements about hormones are correct? (A) Hormones can be peptides, steroids, or amino acid derivatives. (B) Hormones can stimulate the synthesis of target proteins through the activation of specific genes.

An atom with a net positive charge must have more

Amino acids are carried to ribosomes by what?