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What Is the Distribution of
Two Parents Who Are Both Heterozygous for Three Additive
Genes?
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- What is the differencebetween dominant allele andrecessive allele?What genotypes and phenotypes are expected from a cross between a plant that is heterozygous (Rr) and a plant that has green seeds (rr)?In the cross TtPpAa x ttPpaa, what fraction of offspring are predicted to be homozygous recessive for at least two of the three traits?
- A man has attached earlobes, whereas his wife has freeearlobes. Their first child, a boy, has attached earlobes.a. If the phenotypic difference is assumed to be due totwo alleles of a single gene, is it possible that the geneis X linked?b. Is it possible to decide if attached earlobes aredominant or recessive?A cross between two pea plants, both of which grewfrom yellow round seeds, gave the following numbersof seeds: 156 yellow round and 54 yellow wrinkled.What are the genotypes of the parent plants? (Yellowand round are dominant traits.)If the white-flowered parental variety in Figure 1-3 werecrossed to the first-generation hybrid plant in that figure,what types of progeny would you expect to see and inwhat proportions?
- Assume gene B and gene R assort independently. If gene B determines flower color (B=blue and b=white) and gene R determines leaf shape (R=round and r=oval), what proportion of offspring from a cross of BbRr x Bbrr should have blue flowers and oval leaves?are the gene pairs in non allelic interaaction, recessive epistasis independently segragating?We have dealt mainly with only two genes, but the sameprinciples hold for more than two genes. Consider thefollowing cross:A/a ; B/b ; C/c ; D/d ; E/e × a/a ; B/b ; c/c ; D/d ; e/ea. What proportion of progeny will phenotypicallyresemble (1) the first parent, (2) the second parent,(3) either parent, and (4) neither parent?b. What proportion of progeny will be genotypically thesame as (1) the first parent, (2) the second parent,(3) either parent, and (4) neither parent?Assume independent assortment.
- A heterozygous round seeded plant (Rr) is crossed with a homozygous round seeded plant (RR). What percentage of the offspring will be homozygous (RR)? _I. In tomatoes, red fruit is dominant to yellow fruit,and purple stems are dominant to green stems. Theprogeny from one mating consisted of 305 red fruit,purple stem plants; 328 red fruit, green stem plants;110 yellow fruit, purple stem plants; and 97 yellowfruit, green stem plants. What were the genotypesof the parents in this cross?What are the chances of getting a turkey with a red wattle, if red is dominant to blue, when you cross 2 heterozygous (RrxRr) turkeys?