Biology 101 Fall, 2007 Week 4 – Genetics Inherited traits Week 4 – Genetics Inherited traits.
Genetics Notes. Lab 54 1. There can be many different traits for a human characteristic. 2....
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Transcript of Genetics Notes. Lab 54 1. There can be many different traits for a human characteristic. 2....
Lab 54
•1. There can be many different traits for a human characteristic.
•2. Inherited traits are passed from parents to offspring.
Lab 54
•4. Variation of skin tone/color:•A. Skin color varies according to the
amount of melanin.•B. Darker skin has more melanin
and this protects the skin against the damaging effects of solar radiation.
Lab 55
•1. Plants have genes also.•2. All living organisms have genetic information.•3. Genes determine which traits we inherit.•4. Genes are passed from parents to offspring.
Lab 56
•1. Some medical conditions and diseases are genetic, such as Marfan syndrome
•2. Marfan syndrome affects a person’s connective tissue.
Lab 57
•1. Genes are the units of information for inherited traits that parents transmit to their offspring.
Lab 57
•2. Reproduction can be sexual or asexual.•3. Some organisms reproduce using both methods – sexual and asexual.
Lab 57
•4. Asexual reproduction produces genetically identical offspring•A. These offspring are called
“clones” of the parent.•B. Animals have been cloned but
not humans.
Lab 57
•5. Sexual reproduction involves the union of two sex cells – the egg cell and the sperm cell.
Lab 58
•1. Genes are units of information for inherited traits that parents pass to their offspring.•2. Breeding is the mating of two individuals to produce an offspring.
Lab 59
2. If a critter is Tt, there is a 50-50 chance that a parent can pass the blue or orange allele to their offspring.
Lab 59
3. Genetic shorthand for representing dominant or recessive traits can be any upper or lower case letters.Ex. T= tails = blue t= head = orange
Lab 61
•2. TT or tt are examples of homozygous alleles because they have only one kind of alleles for a trait.
Lab 61
•3. Tt is an example of a heterozygous allele because the organism has alleles for two different traits.
Lab 63
2. Multicellular organisms use cell division to replace or repair cells and to grow and develop.
Lab 633. The number of chromosomes in the sperm and egg cells must be half the number of chromosomes in the other cells of an organism. They join to become a fertilized egg.
Lab 63
4. Two children with the same parents would have the same chromosomes but may not be alike since each chromosome contains two alleles for each trait and they can be different.