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Genetics. Kirsten Adams National Cathedral School AP Biology. Figure 14.0x Mendel. Figure 14.1 A genetic cross. Figure 14.2 Mendel tracked heritable characters for three generations. Figure 14.x1 Sweet pea flowers. Figure 14.3 Alleles, alternative versions of a gene.
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Genetics Kirsten Adams National Cathedral School AP Biology
Figure 14.2 Mendel tracked heritable characters for three generations
Table 14.1 The Results of Mendel’s F1 Crosses for Seven Characters in Pea Plants
Figure 14.7 Testing two hypotheses for segregation in a dihybrid cross
Figure 14.8 Segregation of alleles and fertilization as chance events
Problem #1 • In garden peas, tallness is dominant and dwarfness is recessive. A heterozygous tall plant is crossed with a dwarf plant. If 40 offspring are produced, how many will be tall?
Problem #2 • In humans, brown eyes are dominant over blue eyes. A brown-eyed man and a blue-eyed woman have two blue-eyed children. What are the chances that their next child will have blue eyes?
Problem #3 • Cystic Fibrosis is inherited as a simple autosomal recessive. Suppose a woman who carries the trait marries a normal man who does not carry it. What percent of their children would be expected to have the disease?
Problem #4 • Classical Albinism is a single-gene disorder caused by the lack of an enzyme necessary for the synthesis of melanin pigments. Enzyme production requires the presence of one normal allele. What progeny and what proportions are expected from a normally pigmented woman who has an albino husband and an albino father?
Problem 5 • If two individuals with the genotype A/a B/b C/c D/d mate, what is the probabilty of getting an individual with the genotype A/A B/b c/c D/d?
Problem #6 • In watermelons, the genes for green color and for short shape are dominant over alleles for striped color and long shape. A plant that is heterozygous for green color and homozygous for short shape is crossed with a plant that is homozygous for striped color and heterosygous for short shape. What proportion of their offspring will be striped and short?
Problem #7 • In snap dragons, flower color and leaf color are both controlled by partial dominance. Pink flowers and light green leaves are the intermediate conditions. Supposed you crossed two plants, both of which had pink flowers and light green leaves. If there were 16 offspring, how many would you expect to have both pink flowers and light green leaves?
Multiple Alleles Ex. Blood types
Problem 7 • A woman takes Mr. X to court for child support, but Mr. X swears he is not the father. The woman is blood type A and the baby is blood type A. Which blood type must Mr. X have to prove that he is not the father?
Interactions Between Genes Pleiotropy Epistasis Collaboration Complementation Modifier Genes Multiple Gene Inheritance
Figure 14.15 Pleiotropic effects of the sickle-cell allele in a homozygote
Problem 8 • If the dominant allele K is necessary for hearing, and the dominant allele M of another gene results in deafness no matter what other genes are present, what percentage of the offspring produced by the cross between k/k M/m and K/k m/m will be deaf?
Figure 14.12 A simplified model for polygenic inheritance of skin color
Environment Penetrance Expressivity
Sex linked characteristics Holandric X-linked
