Mendel’s law of segregation states that:
-A gene can exist in more than one form or allele.
-Organisms inherit two alleles for each trait.
-When sex cells are produced (by meiosis), allele pairs separate leaving each cell with a single allele for each trait.
-When the two alleles of a pair are different, one is dominant, and the other is recessive.
Hope this helps (:
I'm pretty sure it's cats and dogs
Answer:
Evidence for common ancestry can be found in the fossil record, from comparative anatomy and embryology, from the similarities of cellular processes and structures, and from comparisons of DNA sequences between species.Explanation:
Explanation: Scientists believe the increased risk is due to the extra chromosome, chromosome 21, that causes Down syndrome. Persons born with Down syndrome have three copies (instead of the normal two copies) of this chromosome.
