Quiz — 659ff55e00973_Note_Série le monohybridisme 2 (1).pdf

Question 1 sur 10 20:00

[{"id":70424,"question":"Quel est le génotype d'un individu homozygote dominant pour un caractère ?","option_a":"AA","option_b":"Aa","option_c":"aa","option_d":"A ou a","option_e":"","option_f":"","bonne_reponse":"a","explication":"Un individu homozygote dominant possède deux allèles dominants identiques (AA).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"AA\", \"b\": \"Aa\", \"c\": \"aa\", \"d\": \"A ou a\"}}","_debug_options_count":4},{"id":70425,"question":"Si un croisement entre deux individus donne 100% de descendants à phénotype dominant, que peut-on conclure sur les parents ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"C'est vrai si les deux parents sont homozygotes dominants (AA x AA) ou si l'un est homozygote dominant et l'autre hétérozygote (AA x Aa).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4},{"id":70426,"question":"Quel est le rapport phénotypique attendu dans la F2 d'un croisement monohybride (Aa x Aa) selon Mendel ?","option_a":"3:1","option_b":"1:2:1","option_c":"1:1","option_d":"4:0","option_e":"","option_f":"","bonne_reponse":"a","explication":"Le rapport phénotypique est de 3 individus à phénotype dominant pour 1 individu à phénotype récessif (3:1).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"3:1\", \"b\": \"1:2:1\", \"c\": \"1:1\", \"d\": \"4:0\"}}","_debug_options_count":4},{"id":70427,"question":"Un caractère récessif s'exprime-t-il si l'individu est hétérozygote ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"b","explication":"Faux. Un caractère récessif ne s'exprime que si l'individu est homozygote récessif (aa).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"b\", \"options\": {\"a\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4},{"id":70428,"question":"Quel est le génotype d'un individu présentant un phénotype récessif ?","option_a":"AA","option_b":"Aa","option_c":"aa","option_d":"A ou a","option_e":"","option_f":"","bonne_reponse":"c","explication":"Un individu présentant un phénotype récessif doit être homozygote récessif (aa).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"c\", \"options\": {\"a\": \"AA\", \"b\": \"Aa\", \"c\": \"aa\", \"d\": \"A ou a\"}}","_debug_options_count":4},{"id":70429,"question":"Si deux parents hétérozygotes (Aa) ont un enfant, quelle est la probabilité que cet enfant soit homozygote dominant (AA) ?","option_a":"25%","option_b":"50%","option_c":"75%","option_d":"100%","option_e":"","option_f":"","bonne_reponse":"a","explication":"La probabilité est de 25% (1 chance sur 4) pour un génotype AA dans un croisement Aa x Aa.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"25%\", \"b\": \"50%\", \"c\": \"75%\", \"d\": \"100%\"}}","_debug_options_count":4},{"id":70430,"question":"Un croisement entre un individu homozygote dominant (AA) et un individu homozygote récessif (aa) donne toujours des descendants hétérozygotes (Aa).","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Vrai. Tous les descendants seront hétérozygotes (Aa) dans ce croisement.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4},{"id":70431,"question":"Quel est le rapport génotypique dans la F2 d'un croisement monohybride (Aa x Aa) ?","option_a":"1:2:1","option_b":"3:1","option_c":"1:1","option_d":"4:0","option_e":"","option_f":"","bonne_reponse":"a","explication":"Le rapport génotypique est de 1 AA : 2 Aa : 1 aa (1:2:1).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"1:2:1\", \"b\": \"3:1\", \"c\": \"1:1\", \"d\": \"4:0\"}}","_debug_options_count":4},{"id":70432,"question":"Si un caractère est contrôlé par un allèle récessif, peut-il apparaître dans la descendance de deux parents à phénotype dominant ?","option_a":"Vrai","option_b":"Faux","option_c":"","option_d":"","option_e":"","option_f":"","bonne_reponse":"a","explication":"Vrai. Si les deux parents sont hétérozygotes (Aa), il y a 25% de chances d'avoir un enfant homozygote récessif (aa).","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"a\", \"options\": {\"a\": \"Vrai\", \"b\": \"Faux\", \"c\": \"\", \"d\": \"\"}}","_debug_options_count":4},{"id":70433,"question":"Quel est le génotype d'un individu dont le phénotype est dominant mais dont les deux parents ont un phénotype récessif ?","option_a":"AA","option_b":"Aa","option_c":"aa","option_d":"Impossible à déterminer","option_e":"","option_f":"","bonne_reponse":"d","explication":"C'est impossible. Si les deux parents ont un phénotype récessif, ils sont homozygotes récessifs (aa), et ne peuvent transmettre que des allèles récessifs.","points":1,"type":"qcm","actif":1,"section_id":null,"ordre":0,"_debug_answer_data_type":"string","_debug_answer_data_preview":"{\"correct\": \"d\", \"options\": {\"a\": \"AA\", \"b\": \"Aa\", \"c\": \"aa\", \"d\": \"Impossible à déterminer\"}}","_debug_options_count":4}]