Genetics basics worksheet 2000 answer key

Genetics basics worksheet 2000 answer key

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Name of transcription: Period: Date: Genetics Basics Like any other language, the language of genetics consists of symbols and rules for the use of these symbols. When a studied trait shows dominance, it is observed in nature much more frequently than if it is a recessive form. The capital letter of the dominant form becomes its symbol

(Ex. R comes from round seeds). For the recessive form of the same trait (recessive allea); the symbol remains the same, but has no capital (Ex. r comes from wrinkled seeds). Complete the following chart using these symbol rules. Dominant: tall stems, layers of colored seeds, green pods, yellow seeds, round seeds, recessive axial

flowers: short stems, white seed layers, yellow pods, green seeds, wrinkled seeds, terminal flowers height layers pods shapeof seed color Dominant: Recessive: 1. Using the symbols in the chart above, write the symbols of the allele that would be present in the following homozygotes. Then indicate whether they will express the dominant

or recessive trait. tall plants stemmed terminal white flowers seeds layers yellow seeds yellow pods 2. Write the symbols for the following heterozygotes yellow seeds colorful peas layers of seeds axial round seeds green seeds poded peas high stemmed plants 3. The following letters represent pairs of alles. Indicate whether each pair is

heterozygous or homozygous. Then indicate whether each pair would display a dominant or recessive phenotype. a. DD c. ss e. Tt Genetics Basics Worksheet 2000 b. Dd d. Rr f. yy 1 4. What percentage of alleles do each parent contribute to their offspring? 5. What are the phenotypes for the following dihybrids? TtCc GgYy AaRr TtAa

Crosses with a single feature (Monohybrid) 6. Tall pea plants are dominant over short pea plants. If two high homozygous parents are crossed, then: a. how many tall plants would be expected? b. How many dwarf plants would be expected? c. how many hybrid plants would be expected? d. Punnett Square: 7. If two heterozyous tall pea

plants are crossed, then a. how many tall plants would be expected? b. How many dwarf plants would be expected? c. how many hybrid plants would be expected? d. Punnett Square: 8. If two recessive homozygous plants are crossed, then a. how many tall plants would be expected? b. How many dwarf plants would be expected? c.

how many hybrid plants would be expected? d. Punnett Square: 9. If a tall hybrid plant is crossed with a dwarf plant, then a. how many tall plants would be expected? b. How many dwarf plants would be expected? c. how many hybrid plants would be expected? d. Punnett Square: 10. If a tall pure-bred plant is crossed with a dwarf plant,

then a. how many tall plants would be expected? Genetics Basics Worksheet 2000 2 b. how many dwarf plants would be expected? c. how many hybrid plants expected? d. Punnett Square: In a certain species of rat, the black color dominates white. 11. Cross two black hybrid rats P1 = Punnett Square: F1 genotypes = F1 phenotypes = =

Cross a black heterozygous rat with a white one. P1 = Squareputt: Genotypes F1 = Phenotypes F1 = 13. Short fur in rabbits is dominant for long fur. What phenotypic ratio would you expect from a heterozygous female and a long furry male? 14. If black fur is dominant for white fur in rabbits, what would be the genotypic and phenotypic

ratios resulting from the following crosses? a. black and white homozigot? b. two heterozygous blacks? c. a black-and-white heterozygous? Incomplete domination 15. In Japanese four plants, the flowers can be red or white in the form of purebred. But in hybrid form the flowers are pink and therefore show incomplete dominance. Write

the correct genotype symbols for the following three plants. plants with red flowers plants with pink flowers plants with white flowers plants with flowers 16. What would be possible genotypes and phenotypes resulting from a cross between a pink parent and red mother four o'clock plant? P1 = Punnett Square: Genetics Basics Worksheet

2000 3 F1 genotypes = F1 phenotypes = 17. In radishes, when a homozygous plant for red radishes is crossed with a homozygous white radishes plant, plants are produced that bear purple radishes. R. would the offspring show in a cross between a violet and a white? B. A red and a white? C. A red and a purple? 18. The radishes can

be long, oval or round: long is dominant, round recessive, and oval a mixture of the two. If a farmer has all the oval plants in his garden, what will be the phenotypes of the F1 generation? How many possible combinations of parent cross could occur using F1 generation chickens? 19. The pollinated feature (without horns) in bovine

animals is dominant. The horned feature is recessive. A particular bull questioned is mated to three cows. Cow A, which is horned gives rise to a surveyed calf. Cow B, also with horns, produces a calf with horns. Cow C, which is questioned, produces a calf with horns. Name the genotypes of all parents and display the Punnett squares

and the possible genotypes of each cub resulting from the cross. 20. People with sickle cell anemia have a problem with capillary blockage due to a mutation of the hemoglobin gene. This usually causes death before the reproductive age. This trait is produced by homozygous recessive nn. The heterozygous state of this trait produces

people's overall good health, but some sickle-shaped cells. These people are called carriers. Two heterozygous people are planning a family and asked them to tell them their chances of having a sickle-cell edib. What would you tell them? 21. In radishes, when a homozygous plant for red radishes is crossed with a homozygous plant for

white radishes, plants bearing purple radishes are produced. R. would the offspring show in a cross between a violet and a white? B. A red and a white? Genetics Basics Worksheet 2000 4 C. One and a violet? 22. In short-horned cattle, genes appear for red and white layers. Crosses between a red (RR) and a white (rr) produce a

chicken coat appears a red-grey or roan color. A sheep's cow mates with a white bull. What will be the chicken phenotypes? Crosses with two features (Dihybrid) 23. Some dogs bark when trailing; others are silent. The barking feature is due to a dominant alle. The erect ears are dominant in the fallen ears. What kind of chicken would you

expect from a heterozygous barker, with erect ears, mated in a silent trailer with droop ears? 24. In snap dragons, if purple is dominant over yellow seed layer color, and smooth is dominant over a layer of wrinkled seeds, what would be the expected phenotypic ratio of chickens of a cross between two parents, who are heterozygous for

both alleles? 25. In Snapdragon tall strains are dominant to short stems. Red is completely dominant in the color of white flowers, the heterozygous condition being pink. A tall pink plant is crossed with a short red plant. If tall is heterozygote in this case, what will be the phenotypes of the chicks? Sex issues 26. In Drosophila, the gene for

red eyes, R is dominated for the gene for white eyes, r. This is about sex. Determine the possible genotype and phenotype ratios expected from a cross between, (a) heterozygous and red-eyed male female, (b) a heterozygous female and a white-eyed genetic base worksheet 2000 5 male, (c) a homozygous female and a red-eyed male,

and (d) a homozygous female dominate with a white male. (a) Genotype (b) Genotype (c) Genotype Genotype (d) Genotype Genotype 27. In humans the gene from normal blood clotting, H, is dominating to the gene for hemophilia, h. This is a sex-related trait found on the X chromosome. I'm a normal son, a hemophilic son and two

normal daughters. The father has normal blood clotting. What is the likely genotype for each family member? 28. In humans the gene for normal color vision C, is dominant to the gene from red-green color blindness, c. This trait is related to sex and is found on the X chromosome. Calculate the probable genotype and phenotype of

children born to a blue-eyed woman who is heterozygous for color vision and a heterozygous man with brown eyes who is colorblind. 29. In cats, the black color is due to the gene, B, and the yellow color of its alle b. Yellow is completely dominant in black and with heterozygous state results in a color known as calico (black, yellow and

white spotted). These genes are sex-related. What kind of chicken would you expect from a cross between a black male and a female calico? Genetics Basics Worksheet 2000 6 Curated and Reviewed by Planet Lesson For this basics of the genetic worksheet, students review the concepts of genetic inheritance by alles for inherited

genetic traits in offspring. They identify the dominant and recessive traits given to alleal pairs, answer five questions about genetic crosses, practicing monohybrid, and crosses, and completely sex-bound and cross of incomplete domination. Save time and discover the immersive curriculum for your class. Reviewed and evaluated by

trusted teachers with accreditation. Try it for free

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