Mendelain Genetics: Question Preview (ID: 22000)


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Mendel conducted many different dihybrid crosses of pea plants. He found very similar phenotypic ratios in each second generation, regardless of the combinations of traits.   Based on these results, what did Mendel state in his law of independent as
a) Allele pairs separate independently of each other during mitosis. b) Allele pairs separate independently of each other during meiosis. c) The presence of one allele affects the assortment of another. d) The presence of one trait affects the assortment of another.
Tay-Sachs disease is inherited in an autosomal recessive manner. Which term is used to describe a person who has the gene for Tay-Sachs, but does not have the disease?
a) affected b) diseased c) carrier d) hybrid
Which sentence BEST expresses a main idea stated in Mendel's law of segregation?
a) Organisms inherit two copies of each gene, but donate only one copy to each gamete. b) Parents each donate two gametes, but only one is inherited by the next generation c) Organisms inherit more traits from the female parent than from the male. d) Parents each donate four alleles for each gene passed on to the offspring.
A heterozygous plant (Ss) is crossed with a plant homozygous dominant (SS) for smooth petals. S is dominant for smooth petals, and s is recessive for wrinkled petals. What will MOST LIKELY be the petal texture of the first generation of offspring?
a) All petals in the offspring will be smooth. b) All petals in the offspring will be wrinkled. c) One-half of the petals in the offspring will be smooth, and one-half will be wrinkled. d) Three-fourths of the petals in the offspring will be smooth, and one-fourth will be wrinkled.
A fruit fly is heterozygous for both eye color and wing length (EeWw).    E is dominant for yellow eyes. e is recessive for white eyes. W is dominant for long wings. w is recessive for short wings. What would be the distribution of gametes?
a) 45% yellow eyes; 55% white eyes 45% longs wings; 55% short wings b) 50% yellow eyes; 50% white eyes 50% long wings; 50% short wings c) 75% yellow eyes; 25% white eyes 75% long wings; 25% short wings d) 90% yellow eyes; 10% white eyes 90% long wings; 10% short wings
The genotype of a female pea plant is SSTt. Which combinations of alleles could be present in gametes produced by this plant?
a) ST and st b) ST and St c) St  and st d) St and sT
In order to produce gametes with the genotypes BF, Bf, bF, and bf, what MUST the genotype of the parent be?
a) BBFF b) BbFf c) Bbff d) bbFf
Mrs. Bage started a pea farm, but only planted green peas. When these plants were crossed, they noticed that the plants produced green, yellow, and white peas during the first growing season. What is MOST LIKELY the reason for the difference?
a) Asexual reproduction produced different colors in the offspring. b) Sexual reproduction produced new combinations of alleles. c) Environmental factors affected the color patterns of the gametes. d) Different soil types affected the combination rate of certain alleles.
Researchers crossed a heterozygous tall pea plant (Tt) with a homozygous short pea plant (tt). What is the probability that this cross will produce homozygous short (tt) offspring?
a) 0% b) 25% c) 50% d) 100%
Having a widow's peak is the dominant trait (W), while lacking a widow's peak is the recessive trait (w). If 100% of the offspring are heterozygous, what are the genotypes of the parents?
a) WW and WW b) WW and Ww c) ww and WW d) ww and Ww
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