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Biology 10B Ch 10-11

Mendelian Genetics, Basics of Man Inherit, Complex Inherit, Chromo. Man Heredity

Mendel was the first person to succeed in predicting how traits are _________ from generation to generation. Inherited
In peas, both male and female sex cells, which are called _______, are in the same flower. Gametes
________________ occurs when a male gamete fuses with a female gamete in the same flower. Self-pollination
Mendel used the technique called _________________ to breed one plant with another. Cross-Pollination
Mendel studied only one _____ at a time and analyzed his data mathematically. Trait
In individuals with a heterozygous genotype, the _________ allele of a trait is hidden by the expression of the other phenotype. Recessive
In individuals with a heterozygous genotype, the ________ allele of a trait is visible in the phenotype. Dominant
A cross between plants that involves one characteristic is called a __________ cross. Monohybrid
Mendel also performed ________ crosses, which involve two ____ pairs, with pea plants. Dihybrid, gene
When he crossed two pea plants that were heterozygous for bothseed shape (Rr) and for seed color (Yy), he observed a 9:3:3:1 ________________ among the seeds of the offspring. Phenotypic ratio
A Punnett square shows the possible phenotypes and _________ of the offspring. Genotypes
A ________ shows the inheritance of a particular trait over several generations. Pedigree
An organism with two of the same alleles for a particular trait are said to be __________ for that trait. Homozygous
An organism with two different _______ for a particular trait is heterozygous for that trait. Alleles
When alleles are present in the ____________ state, the ________ trait will be observable. Heterozygous, dominant
An individual who is heterozygous for a _________ disorder is called a carrier. Recessive
Examples of recessive genetic disorders in humans are _______________ and ________. Cystic fibrosis, albinism
Caused by altered genes; results in lack of skin pigment Albinism
Recessive genetic disorder; characterized by body's inability to tolerate glactose Glactosemia
Recessive genetic disorder; gene found on chromosome 15;characterized by lack of enzyme that breaks down fatty acids Tay-Sachs disease
Recessive genetic disorder; affects mucus-producing glands, digestive enzymes, sweat glands Cystic Fibrosis
Dominant genetic disorder; affects the nervous system Huntington's disease
Autosomal dominant genetic condition; affects height and body size Achondroplasia
A scientist uses a pedigree to study family history. (T or F) True
A pedigree traces the inheritance of a particular trait through only two generations. (T or F) False
In a pedigree, one who does not express the trait is represented by a darkened square or circle. (T or F) False
In a pedigree, a horizontal line between two symbols shows that these individuals are the parents of the offspring. (T or F) True
Micrograph of chromosomes Karyotype
Abnormal number of chromosomes Nondisjunction
Withdrawl of tissue from the placenta Chorionic villus sampling
Extra chromosome 21 Down syndrome
Protective cap at the end of a chromosome Telomere
Created by: Danceman8



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