The pedigree chart below shows the individuals in a family who exhibit a certain trait. based on the info in the chart, which of the following provides the best evidence that this is a recessive trait? a. couple 3-4 in the 2nd generation produced children who are identical twins. b. couple 1-2 in the second generation produced children who do show the trait. c. couple 1-2 in the 1st generation produced children who do show the trait. d. couple 3-4 in the 2nd generation produced children who do not show the trait.

The answer is A: Couple 3-4 in the 2nd generation produced children who do not show the trait. If it was a dominant trait, there would be a lot more children with said trait.

he forelimbs below belong to four species that descended in a direct line from the ancestral mammal shown above. of the four descendants shown, which species most likely appeared earliest in evolutionary history?

the principle of segregation describes how pairs of gene variants are separated into reproductive cells. from his data, mendel formulated the principle of segregation. we now know that the segregation of genes occurs during meiosis in eukaryotes, which is a process that produces reproductive cells called gametes.