The correct option is A.
The law of segregation is a law which govern inheritance in living organisms. This law was formed as a result or the work of a biologist called Mendel. The law states that, allele pairs separates during the process of gamete formation and they are later randomly united at fertilization. Every living organism possess two allele for each trait. Each allele carries a specific trait, which can be dominant or recessive or combination of the two. Any of the genes which carry these traits can be united at fertilization.<span />
Answer:
The correct answer is - natural selection.
Explanation:
Natural selection is the process in which an organism adapted according to environmental changes for its survival and increase there number by reproduction.
Charles Darwin was first to explain its activities and now it's established as the major process behind the evolution.
Aye aye, primate adapted according to the environment and develop a character for its survival over a period of time. Natural selection is the connection between structure and function.
Thus, the correct answer is - natural selection.
<span>A
typical human karyotype has 23 types of chromosomes arranged from largest to
smallest. In males and females 22 of these chromosomes look exactly the same
and they are called autosomes. The 23rd pair of chromosomes is the sex
chromosome which differentiates males from females. Females have 2 copies of
the x chromosome. Males have a copy of both x and y chromosome to make the 23rd
pair. <span>
<span>Chromosomes can also have abnormalities that
result to different conditions and identifiable traits. A most common
chromosomal abnormality is the condition called Down Syndrome, where chromosome
21 has a third copy because of an abnormal cell division.</span></span></span>
This would be a recessive disease.
Father is dd
Mother is Dd (has to be because one child has the disease)
Parents cross is dd x Dd which gives rise to Dd (0.5) and dd (0.5). Each time they have a child they have a 50% chance of the child having the disease. In their case, only one of their 3 children is dd. The others though are carriers!