题干

人类红绿色盲的基因位于X染色体上、秃顶的基因位于常染色体上,结合如表信息可预测,图中II﹣3和II﹣4所生子女是(    )

BB

Bb

bb

非秃顶

秃顶

秃顶

非秃顶

非秃顶

秃顶

A:非秃顶色盲儿子的概率为 14

B:非秃顶色盲女儿的概率为 18

C:秃顶色盲儿子的概率为 18

D:秃顶色盲女儿的概率为0

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答案(点此获取答案解析)

C,D

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Rafting the GRAND CANYON Welcomes You!

    For an exciting,fun and challenging white water tours,Rafting the GRAND CANYON is here to help you plan the right tour for you. Whether you want to travel for two days or ten,hike in or not,go on an oar raft or motorized trip,we will help you find the trip that meets your needs.

    For those who will be vacationing on the off­season a trip on the Native American Red River rafting is available year around or a one ­day trip is available on the Colorado River from Diamond Creek to Pierce Ferry (about three hours from Las Vegas).

    Most of the trips depart from Lees Ferry,Arizona (approximately 21/2 hours from the south rim of the Grand Canyon).We offer partial trips which allow you to get on or off at Phantom Ranch located at the bottom of the Grand Canyon National Park South Rim. Requiring a hike in or out,with proper planning the horse ride up or down is also an option. Most trips occur between April and October.

    Since all rafting on the Colorado requires a permit,planning and reserving your trip requires reservations well in advance. Please let us know when you would like to go and we will contact all the river concessionaires (特许权获得者)to help you find the best trip for you.

    For planning your trip,questions,concerns or to make your reservations,please email or call the toll free number below. Since these trips are limited we highly recommend you make your reservations months in advance.

    To talk to a live person call us toll free:1­800­222­6966 or 702­655­6060

    If you have any questions regarding a trip,please CLICK_HERE to fill out our form. This will speed up the process of getting you accurate information regarding your trip.

    If you would like to send us an email other than about an up­coming trip you can contact us at info@raftingthegrandcanyon.com.

    We look forward to helping you plan your trip! (Please NO Travel Agents)