18. If the penetrance of BRCA1 mutation is 60%, what does this mean? Each child

Question

18. If the penetrance of BRCA1 mutation is 60%, what does this mean? Each child of an affected parent has a 60% chance of developing the breast cancer b. a. The life expectancy of people with this mutation is 60% of the average human lifespan. 60% of people with the mutation will develop the breast cancer d, C. 60% of people with this mutation can be cured. 19. In an animal, genes can be found in the Nucleus only a. b. Nucleus and chloroplast vc. Nucleus and mitochondrion d. Nucleus, chloroplasts, and mitochondrion 20. In a plant, the red fruit (R) are dominant over the green fruit (r). However, there is a second gene: "W" masked the expression of red or green fruits, resulting in white fruits; whereas "ww” allows the red or green color to be expressed. If a dihybrid is self-crossed, what would be the phenotypes and phenotypic ratio in F1? a. b. c. d. e. 9 Red: 3 green: 4 white 12 red: 3 green: 1 white 12 white: 3 green: 1 red 12 white: 3 red: 1 green None of these 21. In a plant, the heart-shaped squashed is produced by at least one of H and N allele and the narrow squash is produced by hhnn. If a dihybrid is test-crossed, what would be the phenotypes and phenotypic ratio in F1? a. 3 Heart-shaped : 1 Narrow b. 1 Heart-shaped : 3 Narrow c. 9 Heart-shaped: 7 Narrow d. 15 Heart-shaped : 1 Narrow e. None of these 22. A particular variety of plants has a gene for flower color and a gene for height with the following phenotypes: RR: red flower Rr: pink flower rr: white flower TT: tall Tt: medium tt: short If a dihybrid is self-crossed, what percentage of plants will be red-flowered and tall? e.

Explanation / Answer

The answers are provided below in a sequential manner:

18) 60% of the people with mutation will develop breast cancer.

19) Nucleus chloroplast and mitochondria

20) 12white:3Red :1white

21)15 heart shapred:1narrow

22) 1/16

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