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11 kwi 2022 · Topics include DNA and RNA, transcription and translation, Mendelian genetics, Punnett squares, incomplete dominance, and evolution. The worksheets are in a variety of formats, including Google Apps (slides), PDF files, and PNG and JPG images.
Most genetic traits have a stronger, dominant allele and a weaker, recessive allele. In an individual with a heterozygous genotype, the dominant allele shows up in the offspring and the recessive allele gets covered up and doesn’t show. This is called complete dominance.
In cats, again, black color is dominant to a special, temperature-sensitive albino gene which produces cats with dark legs, faces and tails (Siamese cats, in case you don’t recognize it). A short haired (dominant) Siamese colored female is bred to a long-haired black male.
In pea plants, round (R) is dominant to wrinkled (r). A heterozygous female is crossed with a wrinkled male. Make a Punnett Square to determine the possible offspring.
When an organism has the dominant phenotype, then its genotype can be either heterozygous or homozygous dominant (you can’t tell by looking at it). In order to find out we must do a test cross using an homozygous, recessive organism. For example: In Dalmatian dogs, the gene for black spots is dominant to the gene for liver colored spots. If a ...
Try these activities in your home, at a family reunion, with a group, or at work. Each activity provides an engaging way to learn about traits or better understand disease risk. Just click on the PDF icons to download and print both English and Spanish language versions. Have fun!
Some traits follow predictable inheritance patterns. For example, for pea height, tall (T) is dominant, and short (t) is recessive. All that means is this: • Dominant: it takes one T allele to cause the tall phenotype, no matter what the other allele is. • Recessive: it takes two t alleles to cause the short phenotype.
