Chromosome non-disjunction, anaphase lag and endoreplication
It is true that human has 23 chromosomes, in contrast to chimps who have 24 chromosomes,and lack any pair resembling the long human chromosome 2 pair and instead chimps have two pairs of medium sized chromosome, This would be explained by the fact that the common ancestor of both humans and chimpanzees had 24 chromosomes, however at some point in the human lineage, two chromosomes fused end to end, providing some selective advantage and thus humans ended up having 23 chromosomes instead of 23.
Answer:
100%
Explanation:
No matter how many factors are in the cross, if an 2 purebred (homozygous individuals) are crossed, (one dominant, one recessive) the dominant phenotype will always be displayed.
Imagine a cross with between two individuals true breeding for 6 traits. One shows all dominant genotypes, one shows all recessive genotypes. The only gametes those individuals can pass on will always produce heterozygotes.
AABBCCDDEEFFGG x aabbccddeeffgg
The first individual can only give ABCDEFG alleles. The second individual can only give abcdefg alleles. Therefore, all offspring will be AaBbCcDdEeFfGg, and will therefore express the dominant trait.
