Recessive traits often seem to disappear because two recessive alleles are needed to produce the recessive phenotype. They can skip a generation and then reappear if an individual inherits two copies of the recessive gene. Mendel's experiments revealed that phenotypes could be hidden in one generation, only to reemerge in subsequent generations.
Recessive traits disappear because recessive alleles can hide out in heterozygotes, allowing them to persist in gene pools and natural selection can only see the phenotype, not the genotype. While harmful recessive alleles will be selected against and it's almost impossible for recessive alleles to completely disappear from a gene pool.
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when the fetus is exposed to a teratogen during the embryonic period is delay in growth
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What are some teratogens that affect the fetus?</h3>
Teratogens are any agents that cause an abnormality in a foetus after exposure during pregnancy. Teratogens are typically discovered following an increase in the prevalence of a specific birth defect. In the early 1960s, for example, thalidomide was used to treat morning sickness. The early exposure of the foetus resulted in cases of phocomelia, a congenital malformation in which the hands and feet are attached to abbreviated arms and legs.
Teratogens can also be found in the home or at work. The effect is dependent on the type of agent, dose, duration, and time of exposure. The first half of a pregnancy is the most hazardous. Infectious agents (rubella, cytomegalovirus, varicella, herpes simplex, toxoplasma, syphilis, and others) .
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Answer: The given statement is False.
The range of motion can be defined as the angular or linear distance that an object in motion may normally travel while attached to another object.
In the given question, the two objects are separated from each other. Therefore, the condition of the range of motion is not satisfied. Hence, it is a false statement.
It changes to something else entirely but can be changed back
In bird, females are heterogametic, produce two type of gametes. The two different sex chromosomes of a female bird has been designated to be the Z and W chromosomes. Whereas males have a pair of Z- sex chromosomes. Males are homogametic produce only one type of gametes with Z-sex chromosomes. Thus sex determination is ZW-ZZ type. In humans sex determination is XX-XY type. Males are heterogametic produce X and Y gametes and females are homogametic produce one type of gametes. Therefore, in bird sex are determined by female gametes.
