Your answer would be, B-Turning off gene expression Hope this helped, and sorry if i was wrong
Answer:
....heart and lungs
Explanation:
The organs protected by the thoracic cage include the heart and lungs
If a red-flowered plant is crossed with a pink flower plants, the genotype ratio would be 1:1 for RR and Rr, and 1:1 for red and pink flower phenotypes.
<h3>Monohybrid crossing</h3>
Red trait has the genotype RR.
Pink trait has the genotype Rr:
Crossing both:
RR x Rr
RR Rr RR Rr
Thus, only RR (red flower) plants and Rr (pink flower) plants are produced.
Genotype ratio = 1RR : 1Rr
Phenotype ratio = 1 Red flower : 1 Pink flower
More on monohybrid crossing can be found here: brainly.com/question/1185199
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