The ultimate source is mutation.It is the only way that new alleles and genes are created.
Answer:
B. Living things
Explanation:
cells are the basic unit of life and function
Answer:
properties of carbon responsible for huge number of organic compounds
tetravalency it has a valency of four so one carbon atom can bond with four other atoms or form four bond
The genetic variation between humans and orangutans is the greatest is the right option.
Explanation:
A phylogenetic tree is illustration which shows evolutionary relationship between different species. This concept is based on Darwin's descent with modification.
Human and orangutan are 97% similar in their DNA sequences.
The difference in DNA bases shows large genetic variations in both the species.
The species are organized on the basis of traits that are changed over time as compared to their ancestors as they evolve.
Less related species will have more differences in their DNA sequence.
The phylogenetic tree formed indicates that orangutan and human are less related to each other than other species.
A heterozygous species contain one dominant and one recessive allele. A cross between a purebred tall and short plant will result in 100% tall offspring. Thus, option d is correct.
<h3>What is a genetic cross?</h3>
A genetic cross is a representation of the gametes produced by the two parent species that will undergo the process of fertilization to produce offspring. The crosses can include the heterozygous and purebred species.
The TT allele is a purebred allele that codes for tallness, whereas the tt allele is a purebred recessive allele that codes for shortness. The cross between TT and tt is attached to the image below.
From the cross, it can be said that all the offspring produced are heterozygous tall as there are no offspring with purebred dominant and recessive alleles.
Therefore, option D. 100% of offspring are tall.
Learn more about genetic cross here:
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