A cross between two squash plants that produce yellow squash results in 124 offspring: 93 produce yellow squash and 31 produce green squash. What are the likely genotypes of the plants that were crossed?Group of answer choicesboth yyOne YY, one YyBoth Yyboth YY
Question
A cross between two squash plants that produce yellow squash results in 124 offspring: 93 produce yellow squash and 31 produce green squash. What are the likely genotypes of the plants that were crossed?Group of answer choicesboth yyOne YY, one YyBoth Yyboth YY
Solution
The likely genotypes of the plants that were crossed are both Yy.
Here's why:
-
Yellow squash is dominant (Y) and green squash is recessive (y).
-
If both plants were YY, all offspring would be yellow because they would all receive at least one dominant allele.
-
If one plant was YY and the other was Yy, all offspring would still be yellow because they would all receive at least one dominant allele.
-
If both plants were yy, all offspring would be green because they would all receive two recessive alleles.
-
The only way to get a mix of yellow and green offspring is if both plants are heterozygous (Yy). This would result in a 3:1 ratio of yellow to green offspring, which is close to the 93:31 ratio observed.
Similar Questions
In summer squash, white fruit colour is governed by a dominantallele (W) and yellow fruit colour by the recessive allele (w). Adominant allele at another locus (S) produces disc shaped fruitand its recessive allele (s) yields sphere-shaped fruit.a. What is the genotype of an individual heterozygous for bothgenes?b. What is the genotype of the gametes produced by thatindividual?c. What is the expected phenotypic ratio of the progeny of a crossbetween two plants heterozygous for both genes?
Two pea plants are crossed. 50% percent of the offspring have seeds with a wrinkled appearance (caused by the presence of a homozygous recessive gene). What were the genotypes of the parents?Group of answer choicesRR x rrRr x rrRr x RrRR x Rr
When a true-breeding pea plant that produces yellow round seeds (YYRR) is crossed with a true-breeding pea plant that produces green wrinkled seeds (yyrr), all of the F1 offspring produce yellow round seeds. What fraction of the offspring of a F1 X F1 cross is predicted to produce green round seeds? Group of answer choices
A cross between two pea plants that are hybrid for a single trait produces 60 offspring. Approx- imately how many of the offspring would be expected to exhibit the recessive trait? (1) 15 (2) 45 (3) 30 (4) 60
In a garden of plants of the same species 705 plants have red flowers while 224 had white flowers (i) Work out the ratio of the red to white flowers (ii)Using letter R to represent the dominant gene, work out the cross between F1 offspring and a white flowered plant (iii)what is the genotypic ratio from the cross in(i) above
Upgrade your grade with Knowee
Get personalized homework help. Review tough concepts in more detail, or go deeper into your topic by exploring other relevant questions.