Answer:
The correct answer would be non-disjunction.
Down syndrome refers to the genetic disease caused by the non-disjunction of chromosome number 21.
Non-disjunction refers to the event in which the homologous chromosomes or sister chromatids fail to separate properly during a cell division.
In Down syndrome, the sister chromatids of chromosome 21 fail to separate properly which results in the formation of a gamete with 2 copies of chromosome 21.
When this gamete fertilizes with another gamete, it results in the formation of a zygote with 47 chromosomes, that is, 46 chromosomes + extra copy of chromosome 21.
Answer:
A sensory neuron.
Explanation:
The nervous system can be divided in two systems: the central nervous system and the peripheral nervous system. The central nervous system (CNS) is composed by the brain and the spinal cord. The peripheral nervous system (PNS) consists of the nerves and ganglia. Neurons are specialized cells that form the basic functional unit of the nervous system. There are three types of neurons: sensory, motor and interneurons. The sensory neurons are in charge of bringing signals into the CNS, and the motor neurons are in charge of carrying signals out of the CNS. The interneurons act as intermediaries, passing information between two neurons.
As the name implies, sensory neurons are activated by the senses, for example: sound, visible light, physical contact (heat and cold), chemical signals (smell and taste). The loss of sensation in one hand would be the result of a damaged sensory neuron.
TT is homozygous dominant, gives phenotype tall.
Tt is heterozygous, also gives the phenotype tall.
Are examples of quantitative trait / polygenic inheritance.
A quantitative trait is a phenotype that can be measured and depends on the
cumulative actions of many genes and the environment.
These traits are very variable among individuals, there is a range of phenotypes with continuous
distribution. For examples: height, weight, shoe size and skin color.
Answer:
Because i dont know what the letter is I am just going to say his genotype is big letter small letter, so if the letter is w then his genotype is Ww
His phenotype is the characteristic that is dominant
Explanation:
