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Biology review 4th semester
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In elephants, allele for long trump(L) is dominant to the allele for no short trum(s). A mother with the genotype Ls and a father with the genotype Ls produce an offspring. What is the percent chance that the offspring will have short trump
25%
Two different versions (alleles) of a gene are expressed, and each version makes a slightly different protein
Codominance
One mutated copy of the gene in each cell is sufficient for a person to be affected.
Autosomal dominant disease
Are caused by mutations in genes on the X chromosome, one of the two sex chromosomes in each cell.
X-linked diseases
Phenotype refers to the ______________________ of an individual.
Physical appeareance
Locus is defined as:
Specific location of a gene
The female part of the flower called the __________
Pistil
The male part of the flower called the __________
Stamen
What is a characteristic of viviparous?
The embryo develops inside the female body
What is a characteristic of ovoviviparous?
The embryo develops inside an egg that remains inside the females body
What is a charactieristic of Oviparous?
Eggs laid outside the body
Embryonic stage in which three germ layers of the embryo form in a process called histogenesis.
Gastrulation
Embryonic stage in which the neural tube is formed
Neurulation
Embryonic stage that happens in the first 10 days.
Germination
In which trimester kidneys start to work.
1st trimester
In which trimester occurs the formation of heart and blood vessels.
1st Trimester
In which trimester you can Identify the baby’s sex.
2nd trimester
Mention an example of an organism that reproduces by fragmentation
Starfish
Type of reproduction that happens when two parents make gametes that combine at fertilization to produce offspring with gene combination unlike their parents.
Sexual
Starts with a single cell that copies its DNA and then splits into two identical cells. Most bacteria reproduce this way.
Binary Fision
A reproductive strategy that involves development of a female gamete without fertilization (“female power”).
Parthenogenesis
Is a form of asexual reproduction in plants, in which multicellular structures become detached from the parent plant and develop into new individuals that are genetically identical to the parent plant.
Vegetative reproduction


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