题干

下列有关基因与性状的关系叙述中,正确的是(  )

A:显性性状控制着显性基因也控制着隐性基因

B:显性性状控制着显性基因,隐性性状控制着隐性基因

C:显性基因控制着显性性状也控制着隐性性状

D:显性基因控制着显性性状,隐性基因控制着隐性性状

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答案(点此获取答案解析)

D

同类题1

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    If you are interested to find a part time job or learn something different during your spare time, you can have a look at the following jobs offered by the DC Public Library.

Teens of Distinction Program

    The DC Public Library offers part time jobs for teens through the Teens of Distinction Program. Teens work 10-12 hours per week all year long, helping the library with important tasks and projects. The Teens of Distinction Program is now hiring! To apply, you have to:

● be a DC resident

● have and maintain at least a 2.5 grade point average

● be 16 to 18 years old

● be able to work 10-12 hours per week

● be able to work for DCPL for at least 9 months

Oh, and of course you have to impress us with your wonderful personality!

Teen Volunteer Opportunities

    If you want to earn community service hours for school, Youth202 is a good choice.

    Youth202 is a radio program created by youth and for youth. You can learn radio production skills, interview people around you, and help keep other teens to learn news, events, and anything else you think is important.

Summer Youth Employment Program (SYEP)

    Every summer, teens can work here to help library customers organize books and learn lots of new skills, such as program planning, writing and media production.

    On Friday, January 25 at 12:15 pm, the application for the 2014 SYEP will be open to teens between the ages of 14 and 21.

    Applications will be processed on a first come, first served basis. Space is limited this year, so teens are encouraged to apply early, and remember not to miss the deadline, Saturday, February 16.

同类题4

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    It took multiple weddings for Christine Law to realize what she needed to do. In the summer of 2014, her schedule was packed with friends, marriage celebrations—flowers --- filled occasions that got her thinking, “Where do all the flowers go after the party?” More often than not, they were thrown out. Law, then 27, was confident she could find a better use for them.

    By August, she had a plan: convince couples and companies hosting events to donate their flowers, which she would pick up and deliver within 48 hours to seniors across the city. She wanted to bring beauty into the lives of the elderly. She drew on her experience volunteering with non-profits in order to set up her own organization, which she called Floranthropie. Not having enough bouquets (花束) for all 150 people of a health center, Law asked the staff to provide a list of patients who needed cheering up most, “The first woman I approached thought it was a mistake, and that the flowers couldn't possibly be for her,” says Law. “I said they were a gift, and we talked for a half hour.”

    In addition to health centers, Floranthropie focuses on community groups devoted to the elderly. Theleme is a volunteer for Les Petits Fieres, an organization that aims to help the elderly who don't have a support system. The group receives a dozen or so bouquets from Floranthropie monthly, and then redistributes them. “Our motto is 'flowers before bread,” says Theleme. “We don't focus on primary care, but rather on nourishing (滋养) the spirit. Floranthropie helps that. It's amazing what a big difference a small bouquet can make.”

    In the beginning, most of Floranthropie's donations came through word of mouth. These days, Law receives messages from strangers via her organization's Facebook page and has connected with corporations and flower wholesalers. Law hopes to expand Floranthropie nationally, but at this point is happy to be able to oversee each delivery personally.