Biology Questions
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This substance has both direct (maternal vasodilation and hypoxia) and indirect risks (maternal problems in placenta) to a growing foetus
What percentage of birth defect causes are infection?
What percentage of birth defect causes are due to drugs and chemicals?
The administration of this agent to the pregnant mother directly or indirectly causes structural or functional abnormalities in the foetus or later in the child after birth, which may not be apparent until later in life
condition in which an individual has three number 21 chromosomes, resulting in Down syndrome
This type of agent can induce: o Chromosomal abnormalities o Impairment of implantation of the conceptuso Resorption or abortion of the early embryo o Structural malformations o Intrauterine growth retardation o Foetal. Death o Functional impairment in the neonate (e.g. deafness)o Behavioural abnormalities o Mental retardation
This behaviour in the mother has teratogenicity on the foetus and can cause hypoxia and vasoconstriction, leading to increased risk of spontaneous abortion
Cancer which occurs in the offspring in utero, but not in the mother. A teratogen which could cause this includes: diethylstilboestrol
Affect of pathological substances on the behaviour or functional adaptation of the offspring to its environment
absence of most of the arm with the hands extending flipper-like from the shoulders
anti-nausea medication of the 1960s caused phocomelia (absence of most of the arm with the hands extending flipper-like from the shoulders)
A chromosomal disorder in females in which an X chromosome is missing, making the person XO instead of XX,
Does standing evolution need to be present for evolution to occur?
When a male donkey mates with a female horse, the hybrid offspring is an infertile mule. This reproductive barrier is:
Are populations constantly experiencing genetic drift?
Is natural selection the only way evolution can occur?
Does mutation alone have much of an impact on a population?
Anush is investigating the reaction time of runners to different start sounds. Identify the independent and dependent variable:Independent - Type of runner; Dependent - SpeedCorrect! Independent - Different sounds; Dependent - Reaction timeIndependent - Reaction time; Dependent - Different soundsIndependent - Reaction time; Dependent - Type of Runner
Is evolution a theory or hypothesis?
Can non-random mating occur without changing allele frequency?