Laura

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  • Publicado : 16 de febrero de 2012
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1. A T T (tall) plant is crossed with a tt (short plant).
What percentage of the offspring will be tall? 100%
2. A Tt plant is crossed with a Tt plant. What percentage
of the offspring willbe short? 0%
3. A hetero zygous round seeded plant (Rr) is crossed with a
homozygous round seeded plant (RR). What percentage of
the offspring will be homozygous (RR)? 50%
4. A homozygous roundseeded plant is crossed with a homozygous
wrinkled seeded plant. What are the genotypes of the parents? _AA___x _aa___
What percentage of the offspring will also be homozygous? 0%
5. In peaplants purple flowers are dominant to white flowers.
If two white flowered plants are cross, what percentage of their
offspring will be white flowered? _100%_____________
6. A white floweredplant is crossed with a plant that is
heterozygous for the trait. What percentage of the
offspring will have purple flowers? 0%
7. Two plants, both heterozygous for the gene that controls
flowercolor are crossed. What percentage of their offspring
will have purple flowers? _0%__
What percentage will have white flowers? _100%___
8. In guinea pigs, the allele for short hair is dominant.What genotype would a heterozygous short haired guinea pig have? _Aa______
What genotype would a purebreeding short haired guinea pig have? _AA______
What genotype would a long haired guineapig have? __aa______
9. Show the cross for a pure breeding short haired guinea pig
and a long haired guinea pig. AA x aa
What percentage of the offspring will have short hair? __0%__
10. Showthe cross for two heterozygous guinea pigs. Aa x Aa
What percentage of the offspring will have short hair? _75%_______
What percentage of the offspring will have long hair? __25%_____
11. Twoshort haired guinea pigs are mated several times. Out of 100
offspring, 25 of them have long hair. What are the probable
genotypes of the parents? ____Aa_ x _____Aa___ Show the cross to prove it
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